485BPOS

As filed with the Securities and Exchange Commission on May 4, 2015

Securities Act Registration No. 033-48907

Investment Company Act Registration No. 811-58433

	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549
	FORM N-1A
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		x
	Pre-Effective Amendment No.	¨
	Post-Effective Amendment No. 108	x
	and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		x
	Amendment No. 108

BMO FUNDS, INC.

(Exact Name of Registrant as Specified in Charter)

111 East Kilbourn Avenue, Suite 200
Milwaukee, Wisconsin	53202
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, including Area Code: (800) 236-3863

John M. Blaser

111 East Kilbourn Avenue, Suite 200

Milwaukee, Wisconsin 53202

(Name and Address of Agent for Service)

Copies to:

Michael P. O’Hare, Esq.

Stradley, Ronon, Stevens & Young, LLP

2005 Market Street, Suite 2600

Philadelphia, PA 19103

It is proposed that this filing will become effective (check appropriate box):

x immediately upon filing pursuant to paragraph (b) of Rule 485

¨ On (date) pursuant to paragraph (b) of Rule 485

¨ 60 days after filing pursuant to paragraph (a)(1) of Rule 485

¨ on (date) pursuant to paragraph (a)(1) of Rule 485

¨ 75 days after filing pursuant to paragraph (a)(2) of Rule 485

¨ On (date) pursuant to paragraph (a)(2) of Rule 485

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 108 to the Registration Statement on Form N-1A to be signed on its behalf by the undersigned, duly authorized, in the City of Milwaukee and the State of Wisconsin on the 4th day of May, 2015.

BMO FUNDS, INC.

(Registrant)

By: /s/ John M. Blaser                                         

John M. Blaser

President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 108 to the Registration Statement on Form N-1A has been signed below on May 4, 2015 by the following persons in the capacities indicated.

Signature	Title
/s/ John M. Blaser	President (principal executive officer) and Director
John M. Blaser
/s/ Timothy M. Bonin	Chief Financial Officer and Treasurer (principal financial and accounting officer)
Timothy M. Bonin
*	Director
Larry D. Armel
*	Director
Ridge A. Braunschweig
*	Director
Christopher B. Begy
*	Director
Benjamin M. Cutler
*	Director
John A. Lubs
*	Director
James Mitchell
*	Director
Barbara J. Pope

*By:	/s/ John M. Blaser
	John M. Blaser
	Attorney in fact pursuant to Power of Attorney filed with Post-Effective Amendment No. 87 to the Registration Statement on Form N-1A

EXHIBIT INDEX

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

BMO Alternative Strategies Fund

FUND SUMMARY
BMO Alternative Strategies Fund

Investment Objective:

The Fund seeks capital appreciation with an emphasis on absolute returns.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of certain BMO Funds. More information about these and other discounts is available from your financial professional and under “How to Buy Shares – Sales Charge” on page 21 of this Prospectus and under “How to Buy Shares – Waivers and Reductions of Sales Charges – Class A Shares” beginning on page 21 of this Prospectus and “How to Buy Shares” beginning on page B-34 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees BMO Alternative Strategies Fund		Class A	Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)		5.00%	none
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase)	[1]	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses BMO Alternative Strategies Fund		Class A	Class I
Management Fees		1.70%	1.70%
Distribution (12b-1) Fees		0.25%	none
Other Expenses	[1]	2.83%	2.83%
Dividend and Interest Expenses		0.55%	0.55%
Total Annual Fund Operating Expenses		5.33%	5.08%
Fee Waiver and Expense Reimbursement	[2]	2.58%	2.58%
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	[2]	2.75%	2.50%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are as shown in the table and remain the same. The costs in the one-year example and for the first year of the three-year example reflect the Adviser’s agreement to waive fees and reimburse expenses through December 31, 2016. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:

Expense Example BMO Alternative Strategies Fund (USD $)	Class A	Class I
1 Year	764	253
3 Years	1,796	1,294

Portfolio Turnover

The Fund incurs transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance.

Principal Investment Strategies

The Fund seeks to maintain lower volatility relative to the broad equity and fixed income markets by strategically allocating its assets among a variety of instruments and strategies in an attempt to allow the Fund to participate in market upswings while protecting its assets in market downturns. The Adviser seeks to achieve the Fund’s goal by allocating its assets across a variety of investment strategies, generally by employing multiple sub-advisers (each, a “Sub-Adviser”). In allocating the Fund’s assets among Sub-Advisers, the Adviser seeks to provide diversified exposure across geographies, sectors, market capitalizations and security types.

The Adviser is responsible for setting and monitoring the Fund’s investment guidelines, selecting the Fund’s Sub-Advisers, managing the Fund’s cash, allocating Fund assets among Sub-Advisers, and monitoring the performance of each Sub-Adviser.

The Adviser also may manage a portion of the Fund’s assets to (i) properly position the overall portfolio from a risk management perspective; (ii) manage one or more of the strategies discussed below on a temporary or long-term basis; or (iii) make additional investments at its own discretion. CTC myCFO, LLC (“CTC”), one of the Fund’s Sub-Advisers, assists the Adviser in identifying and selecting the Sub-Advisers and determining the most appropriate allocation of the Fund’s assets among the Sub-Advisers. The identity and number of Sub-Advisers and the allocation of Fund assets among them will change over time.

The Fund’s assets are allocated to Sub-Advisers whose strategies, when combined to form a single portfolio, seek to provide attractive risk-adjusted returns over the long term and overall investment diversification with the aim of decreasing the Fund’s sensitivity to market fluctuations. A range of qualitative and quantitative factors is reviewed when determining the recommendations for allocations to the Sub-Advisers, including each Sub-Adviser’s investment style, historical performance, and portfolio holdings.

The investment strategies that the Sub-Advisers may utilize generally include the following types of investments: (i) equity securities of companies of any market capitalization throughout the world (including the United States), which may include common and preferred stocks, convertible securities, rights and warrants to purchase common stock, depositary receipts and exchange traded funds (“ETFs”); (ii) debt securities, which may include debt securities of governments throughout the world (including the United States) as well as their agencies and/or instrumentalities, debt securities of corporations throughout the world (including the United States), below investment grade debt securities, including defaulted securities and distressed debt (commonly known as “junk bonds”), bank loans, and convertible bonds; and (iii) foreign currencies. The Sub-Advisers invest without limitation in securities of any duration.

In addition, certain Sub-Advisers may engage in long and short sales transactions to employ their strategies. When a Sub-Adviser sells securities short for the Fund, it sells a security that the Fund does not own (but has borrowed) at its current market price in anticipation that the price of the security will decline. To complete the short sale transaction, the Sub-Adviser buys the same security for the Fund in the market at a later date and returns it to the lender. Long positions benefit from an increase in the price of the underlying instrument or asset class, while short positions benefit from a decrease in that price.

The Sub-Advisers may invest in a variety of derivative instruments for hedging or investment purposes. Such derivative instruments may include: (i) futures contracts based on securities, indices, currencies, and/or U.S. government bonds; (ii) foreign currency forward contracts; (iii) swaps, such as credit default swaps, total return swaps, and/or interest rate swaps; and (iv) call and put options on securities and indices, including writing (selling) calls against positions in the portfolio (“covered calls”) or writing (selling) puts on securities and indices. The Sub-Advisers may use any of these derivatives in an effort to enhance returns or manage and/or adjust the risk profile of the Fund or the risk of individual positions. A Sub-Adviser may choose not to hedge its positions. As a result of the Fund’s derivatives usage, the Fund may have economic leverage, which means that the sum of the Fund’s investment exposures through the use of its derivatives may exceed the amount of assets invested in the Fund, although these exposures may vary over time.

In addition to the specific Sub-Adviser Strategies described below, the Adviser may selectively implement an overlay strategy from time to time to manage the risk of the combined portfolio. The Adviser monitors the portion of assets allocated to each Sub-Adviser. The Adviser also reviews the risk profile of the overall portfolio and the Fund’s adherence to investment guidelines. The Adviser may implement the overlay strategy when the Adviser considers the overall portfolio to have more exposure to a certain type of risk than is appropriate, when the Adviser considers the Fund’s volatility to be higher or lower than desired, or to ensure adherence to investment guidelines. On occasion, the Adviser also may utilize the overlay strategy to seek additional returns. In implementing the overlay strategy, the Adviser expects to utilize derivative instruments, such as S&P 500 futures contracts, and may utilize other types of investments at times. The Adviser expects the overlay strategy will allow it to manage the Fund’s risks with more precision with the intent to deliver more consistent returns with lower volatility.

Sub-Adviser Strategies. The Adviser expects that the Sub-Advisers (and, at times, the Adviser) generally will implement one or more of the investment strategies summarized below. These strategies are similar to investment strategies traditionally employed by hedge funds, which include non-traditional or “alternative” strategies. These strategies may be used by a Sub-Adviser or Adviser to seek high total return, to provide hedging benefits, to manage volatility, and/or to provide market-neutral returns for the Fund. From time to time, the Fund may have little or no assets allocated to any one particular strategy in light of economic or other conditions (including the availability of Sub-Advisers), as determined by the Adviser in its sole discretion.

The descriptions of the following investment strategies are subjective, are not complete descriptions of any strategy, and may differ from classifications made by other investment firms that implement similar investment strategies.

Long/Short Equity Strategies: The Adviser or a Sub-Adviser (each, an “Investment Manager”) employing a long/short equity strategy generally seeks to produce returns from investments in the equity markets by combining long and short positions in particular securities or markets. For example, in employing this strategy, an Investment Manager may use fundamental research to identify securities to buy long (with the expectation that they will increase in value) and sell short (with the expectation that they will decrease in value). Other methodologies, such as relative value or event driven, also may be utilized. Under this strategy, the Fund may purchase securities or sell securities short or use options and futures or other derivative instruments on securities, ETFs, or indices to gain long or short exposure to securities or markets. An Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations.

Hedged Credit Strategies: A hedged credit (or long/short fixed income) strategy generally involves an Investment Manager taking both long and short positions in fixed income securities across multiple sectors and credit quality ranges in one or more countries, including developed and emerging market countries. An Investment Manager that employs this strategy generally uses a fundamental driven approach to investing across the capital structure of a company and attempts to profit from investing in all aspects of a company’s capital structure through both long and short positions. Other methodologies, such as event driven also may be utilized. In employing a hedged credit strategy, an Investment Manager may invest in a variety of fixed or variable rate debt instruments and other securities of all credit qualities including high yield bonds, distressed securities, and companies near, or in, bankruptcy. An Investment Manager also may invest in equity securities and other types of securities when employing this type of strategy. These securities may be currently out-of-favor, have low credit ratings, or be affected by other adverse factors. This may be due to an anticipation of an upgrade in the debt instrument’s ratings, expectation that a reorganization will provide greater value, or other business factors that an Investment Manager believes the marketplace has not yet reflected. Under this strategy, the Fund may purchase securities or sell securities short and use collateralized debt obligations and derivative instruments, such as credit default swaps and equity options, to gain long or short exposure to securities or markets.

Event Driven Strategies: An event driven strategy seeks to profit from pricing inefficiencies that may result from specific, catalyst-driven events, such as mergers, spin-offs, corporate restructurings and management changes. Investments pursuant to this strategy focus on company-specific activities and seek to profit from specific events regardless of market direction. An Investment Manager employing this strategy for the Fund may invest in either equity or debt securities, may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations.

Relative Value Strategies: A relative value strategy employs investment techniques that are intended to profit from pricing inefficiencies, which involves taking a position in one financial instrument while offsetting the position with another financial instrument to attempt to benefit from changes in price. For example, an Investment Manager utilizing this strategy may use fundamental monitoring of securities, with macro data analysis to determine the most attractive company-specific securities for both long and short positions. In addition, an Investment Manager may seek to identify pricing inefficiencies in volatile products, such as options, and buy or sell a combination of such derivative instruments to profit from the instruments’ mispricing. Under this strategy, an Investment Manager may purchase securities or sell securities short, including ETFs, and use derivative instruments, including over-the-counter and exchange traded instruments, such as futures, swaps, currency forwards, and options on securities, ETFs, or indices to realize pricing inefficiencies or to hedge the portfolio. An Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations.

Macro Strategies: A macro strategy seeks to profit from anticipated changes in macroeconomic trends in the fixed income, equity, and foreign currency markets. For example, an Investment Manager may establish both long and short positions in interest rate, foreign exchange, equity, and credit markets based on its analysis of global economic conditions. An Investment Manager may use quantitative or other models to identify investment opportunities across asset classes and to forecast trends in the markets and/or may employ a managed futures strategy to profit from shifts in different markets. Certain Investment Managers may implement this strategy primarily through the use of managed futures. Under this strategy, an Investment Manager may purchase securities or sell securities short and use derivative instruments, such as futures and currency forwards. A macro strategy may be either tactical or strategic and an Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations.

In implementing these investment strategies, an Investment Manager may engage in frequent trading of securities. The Adviser may, in its discretion, add to, delete from, or modify the categories of investment strategies employed by the Fund and one or more of the strategies described above may not be represented in the Fund’s holdings at any given time. In addition, in certain circumstances, an Investment Manager may make additional investments in pursuing its investment strategy.

Principal Risks

The Fund cannot assure that it will achieve its investment objective. An investment in the Fund is not a deposit of BMO Harris Bank N.A., or any of its affiliates, and is not insured or guaranteed by the FDIC or any other government agency. The net asset value of the Fund will vary and you could lose money by investing in the Fund. In addition, the Fund is subject to the following risks.

Aggressive Investment Techniques and Strategies Risks. The Fund may invest in and use investment techniques, strategies, and financial instruments that may be considered aggressive. These techniques may expose the Fund to economic leverage or potentially dramatic changes (losses) in the value of its portfolio holdings.

Asset-Backed/Mortgage-Backed Securities Risks. Asset-backed and mortgage-backed securities are subject to risks of prepayment. The Fund’s yield will be reduced if cash from prepaid securities is reinvested in securities with lower interest rates. The risk of prepayment also may decrease the value of mortgage-backed securities. Asset-backed securities may have a higher level of default and recovery risk than mortgage-backed securities. Both of these types of securities may decline in value because of mortgage foreclosures or defaults on the underlying obligations. Credit risk is greater for mortgage-backed and asset-backed securities that are subordinate to another security.

Bank Loan Risks. The Fund’s investments in secured and unsecured participations in bank loans and assignments of such loans may create substantial risk. In making investments in such loans, which are made by banks or other financial intermediaries to borrowers, the Fund depends upon the creditworthiness of the borrower for payment of principal and interest. Many of these instruments may be illiquid or difficult to value. The prices of such instruments may be extremely volatile.

Call Risks. If the securities in which the Fund invests are redeemed by the issuer before maturity (or “called”), the Fund may have to reinvest the proceeds in securities that pay a lower interest rate, which may decrease the Fund’s yield. This will most likely happen when interest rates are declining.

Company Size Risks. Generally, the smaller the market capitalization of a company, the fewer the number of shares traded daily, the less liquid its stock, and the more volatile its price. Companies with smaller market capitalizations also tend to have unproven track records, a limited product or service base, and limited access to capital. These factors also increase risks and make these companies more likely to fail than companies with larger market capitalizations.

Collateralized Debt Obligations (“CDO”) Risks. An investment in a CDO is subject to the risks of debt securities and asset-backed securities generally and also are subject to additional risks, such as liquidity risk; the risk that distributions from collateral securities will not be adequate to make interest or other payments; and the risk that the quality of the collateral may decline in value, default, or be downgraded.

Convertible Securities Risks. Convertible securities are fixed income securities that the Fund has the option to exchange for equity securities at a specified conversion price. Consequently, the value of the convertible security may be exposed to the stock market risk of the underlying stock, or may be exposed to the interest rate or credit risk of the issuer.

Corporate Restructuring Risks. Securities of companies that are involved in company turnarounds, or corporate restructurings, may present special risks because of the high degree of uncertainty that can be associated with such events. It is possible that the market price of securities of companies involved in company turnarounds, or corporate restructurings, may be subject to significant and unpredictable fluctuations.

Credit Risks. Credit risk is the possibility that an issuer will default on a security by failing to pay interest or principal when due. If an issuer defaults, the Fund may lose money. Lower credit ratings correspond to higher credit risk. Bonds rated lower than BBB or Baa have speculative characteristics.

Currency Risks. To the extent that the Fund invests directly in foreign (non-U.S.) currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

Derivatives Risks. Derivatives may be more volatile than investments directly in the underlying securities, involve additional costs, and may involve a small initial investment relative to the risk assumed. In addition, the value of a derivative may not correlate perfectly to the underlying financial asset, index, or other investment or overall securities markets. Specific types of derivative securities also are subject to a number of additional risks, such as:

Options and Futures Risks. Options and futures contracts may be more volatile than investments directly in the underlying securities, involve additional costs, and may involve a small initial investment relative to the risk assumed.

Swap Agreement Risks. A swap agreement may not be assigned without the consent of the counterparty and may result in losses in the event of a default or bankruptcy of the counterparty.

Credit Default Swap Risks. Credit default swaps are subject to general market risks, liquidity risks, and credit risks. If the Fund is a buyer in a credit default swap agreement and no credit event occurs, then it will lose its investment. If the Fund is a seller in a credit default swap and an event of default occurs, there may be a loss of value to the Fund.

Foreign Currency Forwards Risks. Foreign currency forwards are subject to currency risks, liquidity risks, and credit risks. A currency forward may result in losses in the event of a default or bankruptcy of the counterparty. Currency forward contracts may limit potential gain from a positive change in the relationship between the U.S. dollar and foreign currencies.

Leverage Risks. Derivatives and other investments may create economic leverage and can result in losses to the Fund that exceed the original amount invested.

Counterparty Risk. A loss may be sustained as a result of the failure of another party to the contract to make required payments or otherwise fulfill its obligations under the contract’s terms.

Distressed Securities Risks. The Fund’s investment in distressed securities may involve a substantial degree of risk. These instruments, which involve loans, loan participations, bonds, notes, non-performing and sub-performing mortgage loans, typically are unrated, lower-rated, in default, or close to default. Many of these instruments are not publicly traded, and may become illiquid. The prices of such instruments may be extremely volatile. Securities of distressed companies are generally more likely to become worthless than the securities of more financially stable companies. Valuing such instruments may be difficult, and the Fund may lose all of its investment, or it may be required to accept cash or securities with a value less than the Fund’s original investment. Issuers of distressed securities are typically in a weak financial condition and may default, in which case the Fund may lose its entire investment.

Emerging Markets Risks. Investments in emerging markets can involve risks in addition to and greater than those generally associated with investing in more developed foreign markets, which may make emerging market securities more volatile and potentially less liquid than securities issued in more developed markets.

Exchange-Traded Funds Risks. By investing in an ETF, there is a risk that the value of the underlying securities of the ETF may decrease. In addition, the market price of ETF shares may trade at a discount to their net asset value or an active trading market for ETF shares may not develop or be maintained. ETFs in which the Fund invests typically will not be able to replicate exactly the performance of the indices they track. The Fund also will bear its proportionate share of the ETF’s fees (including management and advisory fees) and expenses.

Foreign Securities Risks. Investing in foreign securities may involve additional risks, including currency-rate fluctuations, political and economic instability, differences in financial reporting standards, less-strict regulation of the securities markets, possible imposition of foreign withholding taxes and trading restrictions or economic sanctions. Furthermore, the Fund may incur higher costs and expenses when making foreign investments, which will affect the Fund’s total return.

Government Obligations Risks. With respect to U.S. government securities, no assurance can be given that the U.S. government will provide financial support to U.S. government-sponsored agencies or instrumentalities where it is not obligated to do so by law (such as Fannie Mae or Freddie Mac). As a result, there is a risk that these entities will default on a financial obligation.

High Yield Securities Risks. High yield securities, also referred to as “junk bonds” or non-investment grade securities, are debt securities rated lower than BBB by Standard & Poor’s or Baa by Moody’s Investors Service. These securities tend to be more sensitive to economic conditions than are higher-rated securities, generally involve more credit risk than securities in the higher-rated categories, and are predominantly considered to be speculative. The issuers of high yield securities are typically more leveraged and the risk of loss due to default by an issuer of high yield securities is significantly greater than issuers of higher-rated securities because such securities are generally unsecured and are often subordinated to other creditors. The Fund may have difficulty disposing of certain high yield securities because there may be a thin trading market for such securities.

Income Risks. The Fund’s income could decline due to falling market interest rates. In a falling interest rate environment, the Fund may be required to invest its assets in lower-yielding securities.

Interest Rate Risks. Prices of fixed income securities rise and fall in response to changes in the interest rate paid by similar securities. Generally, when interest rates rise, prices of fixed income securities fall. Interest rate changes have a greater effect on the price of fixed income securities with longer maturities. Interest rate changes also are influenced by a number of factors including government policy, inflation expectations and supply and demand.

Liquidity Risks. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. The market for lower-quality debt instruments, including junk bonds and leveraged loans, is generally less liquid than the market for higher-quality debt instruments. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility.

Management Risks. An Investment Manager’s judgment about the attractiveness, value, level of expected volatility, and potential appreciation of the Fund’s investments may prove to be incorrect. Accordingly, no guarantee exists that the investment techniques used by the Fund’s managers will produce the desired results. In addition, because portions of the Fund’s assets are managed by different Investment Managers using different styles, the Fund could experience overlapping security transactions or take opposite positions in securities of the same issuer or engage in derivatives transactions that may offset each other. Certain Investment Managers may be purchasing securities at the same time other Investment Managers may be selling those same securities, which may lead to higher transaction expenses compared to a fund using a single investment management style. To a significant extent, the Fund’s performance will depend on the success of the Adviser in allocating the Fund’s assets among the various investment strategies and Investment Managers. Because the Adviser will not be subject to fixed limitations upon the amount of Fund assets that may be invested with a single Investment Manager or in a single investment strategy, the Fund may be more heavily exposed to the investment judgments of one or more Investment Managers or the possible increased risk of investing in a limited number of investment strategies. In addition, certain of the Sub-Advisers may have limited experience managing strategies within a registered investment company. Registered investment companies, unlike the private hedge funds the Sub-Advisers may typically manage, are subject to daily cash flows from investors and to certain legal and tax-related restrictions on investments.

Market Direction Risks. Because the Fund will typically hold both long and short positions, the Fund’s results will suffer both when there is a general market advance and the Fund holds significant “short” positions or when there is a general market decline and the Fund holds significant “long” positions.

Model Investment Risks. The success of the investment strategies employed by the Investment Managers depend on the analyses and assessments that were used in developing such strategies, as well as on the accuracy and reliability of models and data provided by third parties. Incorrect analyses and assessments or inaccurate or incomplete models and data could adversely affect performance. Certain low-probability events or factors that are assigned little weight may occur or prove to be more likely or more relevant than expected, for short or extended periods of time. There can be no assurance that these strategies will enable to the Fund to achieve its objective.

Multinational Companies Risks. Investments in multinational companies, including those that are based in the U.S., involve certain risks that may be difficult to predict and can increase the potential for losses. Such risks include, without limitation, those associated with the political, regulatory and economic conditions of each country in which the multinational company conducts business. In addition, fluctuations in currency and risks related to less developed custody and settlement practices may be greater for investments in multinational companies.

Portfolio Turnover Risks. A high portfolio turnover rate (100% or more) may result in the realization and distribution to shareholders of a greater amount of capital gains than if the Fund had a low portfolio turnover rate. Therefore, you may incur a higher tax liability. High portfolio turnover also may result in higher transaction costs, which may negatively affect Fund performance.

Sector Risks. Companies with similar characteristics, such as those within the same industry, may be grouped together in broad categories called sectors. To the extent the Fund assets are focused in a particular sector, the Fund’s performance may be more susceptible to any economic, business, or other developments that generally affect that sector.

Short Sales Risks. The risk on a short sale is the risk of loss if the value of a security sold short increases prior to the delivery date, since the Fund must pay more for the security than it received from the purchaser in the short sale. In addition, it is possible that the Fund’s securities held long will decline in value at the same time that the value of the securities sold short increase in value, increasing the potential for loss. Therefore, the risk of loss may be theoretically unlimited.

Sovereign Debt Securities Risks. Sovereign debt securities are subject to risks in addition to those relating to debt securities and foreign securities, including the risk that a governmental entity may be unwilling or unable to meet its obligations due to insufficient cash flow or foreign reserves, the size of the debt service burden or government monetary policy. In the event of a default on sovereign debt, the Fund also may have limited legal recourse against the defaulting government entity.

Stock Market Risks. The Fund is subject to fluctuations in the stock market, which has periods of increasing and decreasing values. Stocks are more volatile than debt securities. The value of equity securities purchased by the Fund may decline if the financial condition of the companies in which the Fund invests declines or if overall market and economic conditions deteriorate. If the value of the Fund’s investments goes down, you may lose money.

Style Risks. Investments in value stocks are subject to the risk that their intrinsic values may never be realized by the market, that a stock judged to be undervalued may actually be appropriately priced, or that their prices may decline, even though in theory they are already undervalued. Value stocks can react differently to issuer, political, market, and economic developments than the market as a whole and other types of stocks (e.g., growth stocks).

Fund Performance

Performance information is not included because the Fund does not have one full calendar year of performance as of the date of this Prospectus.

[1] The Maximum Deferred Sales Charge on Class A shares is applied only to purchases of $1,000,000 or more that are redeemed within 18 months of purchase.

[1] Because the Fund is new, these expenses are based on estimated amounts for the Fund’s current fiscal year.

[2] BMO Asset Management Corp. (Adviser) has agreed to waive or reduce fees and reimburse expenses to the extent necessary to prevent class total annual operating expenses (excluding dividend and interest expenses, acquired fund fees and expenses, interest, taxes, brokerage commissions, other investment-related costs, and extraordinary expenses, such as litigation and other expenses not incurred in the ordinary course of the Fund’s business) from exceeding 2.20% for Class A and 1.95% for Class I through December 31, 2016. This expense limitation agreement may not be terminated prior to December 31, 2016 without the consent of the Fund’s Board of Directors, unless terminated due to the termination of the advisory agreement.

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Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BMO FUNDS, INC.
Prospectus Date	rr_ProspectusDate	Apr. 28, 2015
BMO Alternative Strategies Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	FUND SUMMARY BMO Alternative Strategies Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks capital appreciation with an emphasis on absolute returns.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of certain BMO Funds. More information about these and other discounts is available from your financial professional and under “How to Buy Shares – Sales Charge” on page 21 of this Prospectus and under “How to Buy Shares – Waivers and Reductions of Sales Charges – Class A Shares” beginning on page 21 of this Prospectus and “How to Buy Shares” beginning on page B-34 of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	December 31, 2016
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund incurs transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance.
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	The Maximum Deferred Sales Charge on Class A shares is applied only to purchases of $1,000,000 or more that are redeemed within 18 months of purchase.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of certain BMO Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Because the Fund is new, these expenses are based on estimated amounts for the Fund’s current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are as shown in the table and remain the same. The costs in the one-year example and for the first year of the three-year example reflect the Adviser’s agreement to waive fees and reimburse expenses through December 31, 2016. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to maintain lower volatility relative to the broad equity and fixed income markets by strategically allocating its assets among a variety of instruments and strategies in an attempt to allow the Fund to participate in market upswings while protecting its assets in market downturns. The Adviser seeks to achieve the Fund’s goal by allocating its assets across a variety of investment strategies, generally by employing multiple sub-advisers (each, a “Sub-Adviser”). In allocating the Fund’s assets among Sub-Advisers, the Adviser seeks to provide diversified exposure across geographies, sectors, market capitalizations and security types. The Adviser is responsible for setting and monitoring the Fund’s investment guidelines, selecting the Fund’s Sub-Advisers, managing the Fund’s cash, allocating Fund assets among Sub-Advisers, and monitoring the performance of each Sub-Adviser. The Adviser also may manage a portion of the Fund’s assets to (i) properly position the overall portfolio from a risk management perspective; (ii) manage one or more of the strategies discussed below on a temporary or long-term basis; or (iii) make additional investments at its own discretion. CTC myCFO, LLC (“CTC”), one of the Fund’s Sub-Advisers, assists the Adviser in identifying and selecting the Sub-Advisers and determining the most appropriate allocation of the Fund’s assets among the Sub-Advisers. The identity and number of Sub-Advisers and the allocation of Fund assets among them will change over time. The Fund’s assets are allocated to Sub-Advisers whose strategies, when combined to form a single portfolio, seek to provide attractive risk-adjusted returns over the long term and overall investment diversification with the aim of decreasing the Fund’s sensitivity to market fluctuations. A range of qualitative and quantitative factors is reviewed when determining the recommendations for allocations to the Sub-Advisers, including each Sub-Adviser’s investment style, historical performance, and portfolio holdings. The investment strategies that the Sub-Advisers may utilize generally include the following types of investments: (i) equity securities of companies of any market capitalization throughout the world (including the United States), which may include common and preferred stocks, convertible securities, rights and warrants to purchase common stock, depositary receipts and exchange traded funds (“ETFs”); (ii) debt securities, which may include debt securities of governments throughout the world (including the United States) as well as their agencies and/or instrumentalities, debt securities of corporations throughout the world (including the United States), below investment grade debt securities, including defaulted securities and distressed debt (commonly known as “junk bonds”), bank loans, and convertible bonds; and (iii) foreign currencies. The Sub-Advisers invest without limitation in securities of any duration. In addition, certain Sub-Advisers may engage in long and short sales transactions to employ their strategies. When a Sub-Adviser sells securities short for the Fund, it sells a security that the Fund does not own (but has borrowed) at its current market price in anticipation that the price of the security will decline. To complete the short sale transaction, the Sub-Adviser buys the same security for the Fund in the market at a later date and returns it to the lender. Long positions benefit from an increase in the price of the underlying instrument or asset class, while short positions benefit from a decrease in that price. The Sub-Advisers may invest in a variety of derivative instruments for hedging or investment purposes. Such derivative instruments may include: (i) futures contracts based on securities, indices, currencies, and/or U.S. government bonds; (ii) foreign currency forward contracts; (iii) swaps, such as credit default swaps, total return swaps, and/or interest rate swaps; and (iv) call and put options on securities and indices, including writing (selling) calls against positions in the portfolio (“covered calls”) or writing (selling) puts on securities and indices. The Sub-Advisers may use any of these derivatives in an effort to enhance returns or manage and/or adjust the risk profile of the Fund or the risk of individual positions. A Sub-Adviser may choose not to hedge its positions. As a result of the Fund’s derivatives usage, the Fund may have economic leverage, which means that the sum of the Fund’s investment exposures through the use of its derivatives may exceed the amount of assets invested in the Fund, although these exposures may vary over time. In addition to the specific Sub-Adviser Strategies described below, the Adviser may selectively implement an overlay strategy from time to time to manage the risk of the combined portfolio. The Adviser monitors the portion of assets allocated to each Sub-Adviser. The Adviser also reviews the risk profile of the overall portfolio and the Fund’s adherence to investment guidelines. The Adviser may implement the overlay strategy when the Adviser considers the overall portfolio to have more exposure to a certain type of risk than is appropriate, when the Adviser considers the Fund’s volatility to be higher or lower than desired, or to ensure adherence to investment guidelines. On occasion, the Adviser also may utilize the overlay strategy to seek additional returns. In implementing the overlay strategy, the Adviser expects to utilize derivative instruments, such as S&P 500 futures contracts, and may utilize other types of investments at times. The Adviser expects the overlay strategy will allow it to manage the Fund’s risks with more precision with the intent to deliver more consistent returns with lower volatility. Sub-Adviser Strategies. The Adviser expects that the Sub-Advisers (and, at times, the Adviser) generally will implement one or more of the investment strategies summarized below. These strategies are similar to investment strategies traditionally employed by hedge funds, which include non-traditional or “alternative” strategies. These strategies may be used by a Sub-Adviser or Adviser to seek high total return, to provide hedging benefits, to manage volatility, and/or to provide market-neutral returns for the Fund. From time to time, the Fund may have little or no assets allocated to any one particular strategy in light of economic or other conditions (including the availability of Sub-Advisers), as determined by the Adviser in its sole discretion. The descriptions of the following investment strategies are subjective, are not complete descriptions of any strategy, and may differ from classifications made by other investment firms that implement similar investment strategies. Long/Short Equity Strategies: The Adviser or a Sub-Adviser (each, an “Investment Manager”) employing a long/short equity strategy generally seeks to produce returns from investments in the equity markets by combining long and short positions in particular securities or markets. For example, in employing this strategy, an Investment Manager may use fundamental research to identify securities to buy long (with the expectation that they will increase in value) and sell short (with the expectation that they will decrease in value). Other methodologies, such as relative value or event driven, also may be utilized. Under this strategy, the Fund may purchase securities or sell securities short or use options and futures or other derivative instruments on securities, ETFs, or indices to gain long or short exposure to securities or markets. An Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations. Hedged Credit Strategies: A hedged credit (or long/short fixed income) strategy generally involves an Investment Manager taking both long and short positions in fixed income securities across multiple sectors and credit quality ranges in one or more countries, including developed and emerging market countries. An Investment Manager that employs this strategy generally uses a fundamental driven approach to investing across the capital structure of a company and attempts to profit from investing in all aspects of a company’s capital structure through both long and short positions. Other methodologies, such as event driven also may be utilized. In employing a hedged credit strategy, an Investment Manager may invest in a variety of fixed or variable rate debt instruments and other securities of all credit qualities including high yield bonds, distressed securities, and companies near, or in, bankruptcy. An Investment Manager also may invest in equity securities and other types of securities when employing this type of strategy. These securities may be currently out-of-favor, have low credit ratings, or be affected by other adverse factors. This may be due to an anticipation of an upgrade in the debt instrument’s ratings, expectation that a reorganization will provide greater value, or other business factors that an Investment Manager believes the marketplace has not yet reflected. Under this strategy, the Fund may purchase securities or sell securities short and use collateralized debt obligations and derivative instruments, such as credit default swaps and equity options, to gain long or short exposure to securities or markets. Event Driven Strategies: An event driven strategy seeks to profit from pricing inefficiencies that may result from specific, catalyst-driven events, such as mergers, spin-offs, corporate restructurings and management changes. Investments pursuant to this strategy focus on company-specific activities and seek to profit from specific events regardless of market direction. An Investment Manager employing this strategy for the Fund may invest in either equity or debt securities, may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations. Relative Value Strategies: A relative value strategy employs investment techniques that are intended to profit from pricing inefficiencies, which involves taking a position in one financial instrument while offsetting the position with another financial instrument to attempt to benefit from changes in price. For example, an Investment Manager utilizing this strategy may use fundamental monitoring of securities, with macro data analysis to determine the most attractive company-specific securities for both long and short positions. In addition, an Investment Manager may seek to identify pricing inefficiencies in volatile products, such as options, and buy or sell a combination of such derivative instruments to profit from the instruments’ mispricing. Under this strategy, an Investment Manager may purchase securities or sell securities short, including ETFs, and use derivative instruments, including over-the-counter and exchange traded instruments, such as futures, swaps, currency forwards, and options on securities, ETFs, or indices to realize pricing inefficiencies or to hedge the portfolio. An Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations. Macro Strategies: A macro strategy seeks to profit from anticipated changes in macroeconomic trends in the fixed income, equity, and foreign currency markets. For example, an Investment Manager may establish both long and short positions in interest rate, foreign exchange, equity, and credit markets based on its analysis of global economic conditions. An Investment Manager may use quantitative or other models to identify investment opportunities across asset classes and to forecast trends in the markets and/or may employ a managed futures strategy to profit from shifts in different markets. Certain Investment Managers may implement this strategy primarily through the use of managed futures. Under this strategy, an Investment Manager may purchase securities or sell securities short and use derivative instruments, such as futures and currency forwards. A macro strategy may be either tactical or strategic and an Investment Manager employing this strategy for the Fund may invest in one or more countries, including developed and emerging market countries, and may specialize in specific sectors, industries, or market capitalizations. In implementing these investment strategies, an Investment Manager may engage in frequent trading of securities. The Adviser may, in its discretion, add to, delete from, or modify the categories of investment strategies employed by the Fund and one or more of the strategies described above may not be represented in the Fund’s holdings at any given time. In addition, in certain circumstances, an Investment Manager may make additional investments in pursuing its investment strategy.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The Fund cannot assure that it will achieve its investment objective. An investment in the Fund is not a deposit of BMO Harris Bank N.A., or any of its affiliates, and is not insured or guaranteed by the FDIC or any other government agency. The net asset value of the Fund will vary and you could lose money by investing in the Fund. In addition, the Fund is subject to the following risks. Aggressive Investment Techniques and Strategies Risks. The Fund may invest in and use investment techniques, strategies, and financial instruments that may be considered aggressive. These techniques may expose the Fund to economic leverage or potentially dramatic changes (losses) in the value of its portfolio holdings. Asset-Backed/Mortgage-Backed Securities Risks. Asset-backed and mortgage-backed securities are subject to risks of prepayment. The Fund’s yield will be reduced if cash from prepaid securities is reinvested in securities with lower interest rates. The risk of prepayment also may decrease the value of mortgage-backed securities. Asset-backed securities may have a higher level of default and recovery risk than mortgage-backed securities. Both of these types of securities may decline in value because of mortgage foreclosures or defaults on the underlying obligations. Credit risk is greater for mortgage-backed and asset-backed securities that are subordinate to another security. Bank Loan Risks. The Fund’s investments in secured and unsecured participations in bank loans and assignments of such loans may create substantial risk. In making investments in such loans, which are made by banks or other financial intermediaries to borrowers, the Fund depends upon the creditworthiness of the borrower for payment of principal and interest. Many of these instruments may be illiquid or difficult to value. The prices of such instruments may be extremely volatile. Call Risks. If the securities in which the Fund invests are redeemed by the issuer before maturity (or “called”), the Fund may have to reinvest the proceeds in securities that pay a lower interest rate, which may decrease the Fund’s yield. This will most likely happen when interest rates are declining. Company Size Risks. Generally, the smaller the market capitalization of a company, the fewer the number of shares traded daily, the less liquid its stock, and the more volatile its price. Companies with smaller market capitalizations also tend to have unproven track records, a limited product or service base, and limited access to capital. These factors also increase risks and make these companies more likely to fail than companies with larger market capitalizations. Collateralized Debt Obligations (“CDO”) Risks. An investment in a CDO is subject to the risks of debt securities and asset-backed securities generally and also are subject to additional risks, such as liquidity risk; the risk that distributions from collateral securities will not be adequate to make interest or other payments; and the risk that the quality of the collateral may decline in value, default, or be downgraded. Convertible Securities Risks. Convertible securities are fixed income securities that the Fund has the option to exchange for equity securities at a specified conversion price. Consequently, the value of the convertible security may be exposed to the stock market risk of the underlying stock, or may be exposed to the interest rate or credit risk of the issuer. Corporate Restructuring Risks. Securities of companies that are involved in company turnarounds, or corporate restructurings, may present special risks because of the high degree of uncertainty that can be associated with such events. It is possible that the market price of securities of companies involved in company turnarounds, or corporate restructurings, may be subject to significant and unpredictable fluctuations. Credit Risks. Credit risk is the possibility that an issuer will default on a security by failing to pay interest or principal when due. If an issuer defaults, the Fund may lose money. Lower credit ratings correspond to higher credit risk. Bonds rated lower than BBB or Baa have speculative characteristics. Currency Risks. To the extent that the Fund invests directly in foreign (non-U.S.) currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivatives Risks. Derivatives may be more volatile than investments directly in the underlying securities, involve additional costs, and may involve a small initial investment relative to the risk assumed. In addition, the value of a derivative may not correlate perfectly to the underlying financial asset, index, or other investment or overall securities markets. Specific types of derivative securities also are subject to a number of additional risks, such as: Options and Futures Risks. Options and futures contracts may be more volatile than investments directly in the underlying securities, involve additional costs, and may involve a small initial investment relative to the risk assumed. Swap Agreement Risks. A swap agreement may not be assigned without the consent of the counterparty and may result in losses in the event of a default or bankruptcy of the counterparty. Credit Default Swap Risks. Credit default swaps are subject to general market risks, liquidity risks, and credit risks. If the Fund is a buyer in a credit default swap agreement and no credit event occurs, then it will lose its investment. If the Fund is a seller in a credit default swap and an event of default occurs, there may be a loss of value to the Fund. Foreign Currency Forwards Risks. Foreign currency forwards are subject to currency risks, liquidity risks, and credit risks. A currency forward may result in losses in the event of a default or bankruptcy of the counterparty. Currency forward contracts may limit potential gain from a positive change in the relationship between the U.S. dollar and foreign currencies. Leverage Risks. Derivatives and other investments may create economic leverage and can result in losses to the Fund that exceed the original amount invested. Counterparty Risk. A loss may be sustained as a result of the failure of another party to the contract to make required payments or otherwise fulfill its obligations under the contract’s terms. Distressed Securities Risks. The Fund’s investment in distressed securities may involve a substantial degree of risk. These instruments, which involve loans, loan participations, bonds, notes, non-performing and sub-performing mortgage loans, typically are unrated, lower-rated, in default, or close to default. Many of these instruments are not publicly traded, and may become illiquid. The prices of such instruments may be extremely volatile. Securities of distressed companies are generally more likely to become worthless than the securities of more financially stable companies. Valuing such instruments may be difficult, and the Fund may lose all of its investment, or it may be required to accept cash or securities with a value less than the Fund’s original investment. Issuers of distressed securities are typically in a weak financial condition and may default, in which case the Fund may lose its entire investment. Emerging Markets Risks. Investments in emerging markets can involve risks in addition to and greater than those generally associated with investing in more developed foreign markets, which may make emerging market securities more volatile and potentially less liquid than securities issued in more developed markets. Exchange-Traded Funds Risks. By investing in an ETF, there is a risk that the value of the underlying securities of the ETF may decrease. In addition, the market price of ETF shares may trade at a discount to their net asset value or an active trading market for ETF shares may not develop or be maintained. ETFs in which the Fund invests typically will not be able to replicate exactly the performance of the indices they track. The Fund also will bear its proportionate share of the ETF’s fees (including management and advisory fees) and expenses. Foreign Securities Risks. Investing in foreign securities may involve additional risks, including currency-rate fluctuations, political and economic instability, differences in financial reporting standards, less-strict regulation of the securities markets, possible imposition of foreign withholding taxes and trading restrictions or economic sanctions. Furthermore, the Fund may incur higher costs and expenses when making foreign investments, which will affect the Fund’s total return. Government Obligations Risks. With respect to U.S. government securities, no assurance can be given that the U.S. government will provide financial support to U.S. government-sponsored agencies or instrumentalities where it is not obligated to do so by law (such as Fannie Mae or Freddie Mac). As a result, there is a risk that these entities will default on a financial obligation. High Yield Securities Risks. High yield securities, also referred to as “junk bonds” or non-investment grade securities, are debt securities rated lower than BBB by Standard & Poor’s or Baa by Moody’s Investors Service. These securities tend to be more sensitive to economic conditions than are higher-rated securities, generally involve more credit risk than securities in the higher-rated categories, and are predominantly considered to be speculative. The issuers of high yield securities are typically more leveraged and the risk of loss due to default by an issuer of high yield securities is significantly greater than issuers of higher-rated securities because such securities are generally unsecured and are often subordinated to other creditors. The Fund may have difficulty disposing of certain high yield securities because there may be a thin trading market for such securities. Income Risks. The Fund’s income could decline due to falling market interest rates. In a falling interest rate environment, the Fund may be required to invest its assets in lower-yielding securities. Interest Rate Risks. Prices of fixed income securities rise and fall in response to changes in the interest rate paid by similar securities. Generally, when interest rates rise, prices of fixed income securities fall. Interest rate changes have a greater effect on the price of fixed income securities with longer maturities. Interest rate changes also are influenced by a number of factors including government policy, inflation expectations and supply and demand. Liquidity Risks. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. The market for lower-quality debt instruments, including junk bonds and leveraged loans, is generally less liquid than the market for higher-quality debt instruments. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility. Management Risks. An Investment Manager’s judgment about the attractiveness, value, level of expected volatility, and potential appreciation of the Fund’s investments may prove to be incorrect. Accordingly, no guarantee exists that the investment techniques used by the Fund’s managers will produce the desired results. In addition, because portions of the Fund’s assets are managed by different Investment Managers using different styles, the Fund could experience overlapping security transactions or take opposite positions in securities of the same issuer or engage in derivatives transactions that may offset each other. Certain Investment Managers may be purchasing securities at the same time other Investment Managers may be selling those same securities, which may lead to higher transaction expenses compared to a fund using a single investment management style. To a significant extent, the Fund’s performance will depend on the success of the Adviser in allocating the Fund’s assets among the various investment strategies and Investment Managers. Because the Adviser will not be subject to fixed limitations upon the amount of Fund assets that may be invested with a single Investment Manager or in a single investment strategy, the Fund may be more heavily exposed to the investment judgments of one or more Investment Managers or the possible increased risk of investing in a limited number of investment strategies. In addition, certain of the Sub-Advisers may have limited experience managing strategies within a registered investment company. Registered investment companies, unlike the private hedge funds the Sub-Advisers may typically manage, are subject to daily cash flows from investors and to certain legal and tax-related restrictions on investments. Market Direction Risks. Because the Fund will typically hold both long and short positions, the Fund’s results will suffer both when there is a general market advance and the Fund holds significant “short” positions or when there is a general market decline and the Fund holds significant “long” positions. Model Investment Risks. The success of the investment strategies employed by the Investment Managers depend on the analyses and assessments that were used in developing such strategies, as well as on the accuracy and reliability of models and data provided by third parties. Incorrect analyses and assessments or inaccurate or incomplete models and data could adversely affect performance. Certain low-probability events or factors that are assigned little weight may occur or prove to be more likely or more relevant than expected, for short or extended periods of time. There can be no assurance that these strategies will enable to the Fund to achieve its objective. Multinational Companies Risks. Investments in multinational companies, including those that are based in the U.S., involve certain risks that may be difficult to predict and can increase the potential for losses. Such risks include, without limitation, those associated with the political, regulatory and economic conditions of each country in which the multinational company conducts business. In addition, fluctuations in currency and risks related to less developed custody and settlement practices may be greater for investments in multinational companies. Portfolio Turnover Risks. A high portfolio turnover rate (100% or more) may result in the realization and distribution to shareholders of a greater amount of capital gains than if the Fund had a low portfolio turnover rate. Therefore, you may incur a higher tax liability. High portfolio turnover also may result in higher transaction costs, which may negatively affect Fund performance. Sector Risks. Companies with similar characteristics, such as those within the same industry, may be grouped together in broad categories called sectors. To the extent the Fund assets are focused in a particular sector, the Fund’s performance may be more susceptible to any economic, business, or other developments that generally affect that sector. Short Sales Risks. The risk on a short sale is the risk of loss if the value of a security sold short increases prior to the delivery date, since the Fund must pay more for the security than it received from the purchaser in the short sale. In addition, it is possible that the Fund’s securities held long will decline in value at the same time that the value of the securities sold short increase in value, increasing the potential for loss. Therefore, the risk of loss may be theoretically unlimited. Sovereign Debt Securities Risks. Sovereign debt securities are subject to risks in addition to those relating to debt securities and foreign securities, including the risk that a governmental entity may be unwilling or unable to meet its obligations due to insufficient cash flow or foreign reserves, the size of the debt service burden or government monetary policy. In the event of a default on sovereign debt, the Fund also may have limited legal recourse against the defaulting government entity. Stock Market Risks. The Fund is subject to fluctuations in the stock market, which has periods of increasing and decreasing values. Stocks are more volatile than debt securities. The value of equity securities purchased by the Fund may decline if the financial condition of the companies in which the Fund invests declines or if overall market and economic conditions deteriorate. If the value of the Fund’s investments goes down, you may lose money. Style Risks. Investments in value stocks are subject to the risk that their intrinsic values may never be realized by the market, that a stock judged to be undervalued may actually be appropriately priced, or that their prices may decline, even though in theory they are already undervalued. Value stocks can react differently to issuer, political, market, and economic developments than the market as a whole and other types of stocks (e.g., growth stocks).
Risk Lose Money [Text]	rr_RiskLoseMoney	The net asset value of the Fund will vary and you could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a deposit of BMO Harris Bank N.A., or any of its affiliates, and is not insured or guaranteed by the FDIC or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Fund Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Performance information is not included because the Fund does not have one full calendar year of performance as of the date of this Prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Performance information is not included because the Fund does not have one full calendar year of performance as of the date of this Prospectus.
BMO Alternative Strategies Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.00%
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management Fees	rr_ManagementFeesOverAssets	1.70%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Dividend and Interest Expenses	rr_Component1OtherExpensesOverAssets	0.55%
Other Expenses	rr_OtherExpensesOverAssets	2.83%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	5.33%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	2.58%	[3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	2.75%	[3]
1 Year	rr_ExpenseExampleYear01	764
3 Years	rr_ExpenseExampleYear03	1,796
BMO Alternative Strategies Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase)	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Management Fees	rr_ManagementFeesOverAssets	1.70%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Dividend and Interest Expenses	rr_Component1OtherExpensesOverAssets	0.55%
Other Expenses	rr_OtherExpensesOverAssets	2.83%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	5.08%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	2.58%	[3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	2.50%	[3]
1 Year	rr_ExpenseExampleYear01	253
3 Years	rr_ExpenseExampleYear03	1,294

[1] The Maximum Deferred Sales Charge on Class A shares is applied only to purchases of $1,000,000 or more that are redeemed within 18 months of purchase.

[2] Because the Fund is new, these expenses are based on estimated amounts for the Fund’s current fiscal year.

[3] BMO Asset Management Corp. (Adviser) has agreed to waive or reduce fees and reimburse expenses to the extent necessary to prevent class total annual operating expenses (excluding dividend and interest expenses, acquired fund fees and expenses, interest, taxes, brokerage commissions, other investment-related costs, and extraordinary expenses, such as litigation and other expenses not incurred in the ordinary course of the Fund’s business) from exceeding 2.20% for Class A and 1.95% for Class I through December 31, 2016. This expense limitation agreement may not be terminated prior to December 31, 2016 without the consent of the Fund’s Board of Directors, unless terminated due to the termination of the advisory agreement.

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Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BMO FUNDS, INC.
Prospectus Date	rr_ProspectusDate	Apr. 28, 2015
Document Creation Date	dei_DocumentCreationDate	Apr. 28, 2015

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Risk/Return:	rr_RiskReturnAbstract
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Document Period End Date	dei_DocumentPeriodEndDate	Apr. 28, 2015
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Central Index Key	dei_EntityCentralIndexKey	0000889366
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 28, 2015
Document Effective Date	dei_DocumentEffectiveDate	Apr. 28, 2015
Prospectus Date	rr_ProspectusDate	Apr. 28, 2015