<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-08-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000891024</issuerCik>
        <issuerName>PATTERSON COMPANIES, INC.</issuerName>
        <issuerTradingSymbol>PDCO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001712443</rptOwnerCik>
            <rptOwnerName>POHLMAN KEVIN M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>822 7TH STREET, SUITE 740</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GREELEY</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80631</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President - Animal Health</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-08-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>51</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.92</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77816</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>791</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By ESOP</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Options</value>
                <footnoteId id="F6"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>22.25</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <value>2029-07-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>33784</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33784</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Options</value>
                <footnoteId id="F8"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>22.48</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2021-07-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2028-07-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13345</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13345</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Options</value>
                <footnoteId id="F9"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>39.23</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2020-08-07</value>
            </exerciseDate>
            <expirationDate>
                <value>2027-08-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5539</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5539</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Options</value>
                <footnoteId id="F10"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>47.51</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2020-07-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2027-07-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13935</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13935</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock withheld for payment of taxes incurred upon the lapse of restrictions on Restricted Stock Units (&quot;RSUs&quot;) issued pursuant to the Patterson Companies, Inc. Amended and Restated 2015 Omnibus Incentive Plan (&quot;Plan&quot;).</footnote>
        <footnote id="F2">Includes 2,233 shares acquired pursuant to Reporting Person's participation in the Patterson Companies, Inc. Capital Accumulation Plan in the year 2017 and remain subject to the terms of such plan.</footnote>
        <footnote id="F3">Includes 42,191 RSUs awarded to Reporting Person pursuant to a Restrictive Covenants, Severance and Change in Control Agreement between Patterson Companies, Inc. and the Reporting Person.  Each RSU represents a right to receive one share of common stock upon vesting.  The RSUs are issued under the Plan and will vest, contingent upon continued employment as follows: 14,063 units vest on 6/11/2020 and 28,128 units vest on 6/11/2021.</footnote>
        <footnote id="F4">Includes 12,323 RSUs awarded on 9/21/2015, 7/1/2016, 7/1/2017, 8/7/2017, 7/1/2018 and 7/1/2019 to Reporting Person pursuant to the Plan.  The RSUs vest contingent upon continued employment as follows: 313 units vest on 9/21/2019, 1,879 units in aggregate vest on 7/1/2020, 191 units vest on 8/7/2020, 314 units vest on 9/21/2020, 1,881 units in aggregate vest on 7/1/2021, 191 units vest on 8/7/2021, 6,473 units vest on 7/1/2022, 191 units vest on 8/7/2022 and 890 units vest on 7/1/2023.</footnote>
        <footnote id="F5">Represents shares of common stock indirectly held by the Reporting Person's Employee Stock Ownership Plan (ESOP) account through June 28, 2019.</footnote>
        <footnote id="F6">Stock options granted pursuant to the Plan on 7/1/2019.</footnote>
        <footnote id="F7">Options are exercisable as follows: 33% on 7/1/2020, 33% on 7/1/2021 and 34% on 7/1/2022.</footnote>
        <footnote id="F8">Stock options granted pursuant to the Plan on 7/1/2018.</footnote>
        <footnote id="F9">Stock option granted pursuant to the Plan on 8/7/2017.</footnote>
        <footnote id="F10">Stock option granted pursuant to the Plan on 7/1/2017.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Les B. Korsh, by Power of Attorney</signatureName>
        <signatureDate>2019-08-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
