Label

Element

Value

Frontier Silk Invest New Horizons Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0001014913_SupplementTextBlock

FRONTIER FUNDS, INC.

Frontier Silk Invest New Horizons Fund

Institutional Class Shares (FSNHX)

Service Class Shares (FNHSX)

Supplement dated August 25, 2016 to the Prospectus dated May 25, 2016

Risk/Return [Heading]

rr_RiskReturnHeading

Frontier Silk Invest New Horizons Fund

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Frontier Silk Invest New Horizons Fund (the “Fund”) may invest in other depositary receipts in addition to American Depositary Receipts as part of its principal investment strategy.  

Accordingly, the risk factor entitled “American Depositary Receipts Risks (“ADRs”)” on page 3 of the summary section is hereby deleted and replaced with the following:

“Depositary Receipts Risks.  The risks of depositary receipts (including American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”)) include many of the risks associated with investing directly in foreign securities, such as currency-rate fluctuations and political and economic instability.”

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE