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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-03-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001279363</issuerCik>
        <issuerName>WELLCARE HEALTH PLANS, INC.</issuerName>
        <issuerTradingSymbol>WCG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001498992</rptOwnerCik>
            <rptOwnerName>Burdick Kenneth A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WELLCARE HEALTH PLANS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>8735 HENDERSON ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33634</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Stock</value>
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            <transactionDate>
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                </transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
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        <nonDerivativeTransaction>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>85140</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Market Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F20"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-03-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1787</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F21"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F21"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1787</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Settlement of performance stock units that were granted on February 27, 2014 and vested on March 1, 2017 based upon the achievement of performance goals for the three-year performance period ending December 31, 2016.</footnote>
        <footnote id="F2">Forfeiture of shares to satisfy tax obligations related to performance stock units that were granted to the Reporting Person on February 27, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F3">Settlement of performance stock units that were granted on June 16, 2014 and vested on March 1, 2017 based upon the achievement of performance goals for the three-year performance period ending December 31, 2016.</footnote>
        <footnote id="F4">Forfeiture of shares to satisfy tax obligations related to performance stock units that were granted to the Reporting Person on June 16, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F5">Settlement of performance stock units that were granted on September 2, 2014 and vested on March 1, 2017 based upon the achievement of performance goals for the performance period ending December 31, 2016.</footnote>
        <footnote id="F6">Forfeiture of shares to satisfy tax obligations related to performance stock units that were granted to the Reporting Person on September 2, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F7">Vesting of restricted stock units granted to the Reporting Person on February 27, 2014.</footnote>
        <footnote id="F8">Forfeiture of shares to satisfy tax obligations related to restricted stock units that were granted to the Reporting Person on February 27, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F9">Vesting of restricted stock units granted to the Reporting Person on June 16, 2014.</footnote>
        <footnote id="F10">Forfeiture of shares to satisfy tax obligations related to restricted stock units that were granted to the Reporting Person on June 16, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F11">Vesting of restricted stock units granted to the Reporting Person on March 28, 2016.</footnote>
        <footnote id="F12">Forfeiture of shares to satisfy tax obligations related to restricted stock units that were granted to the Reporting Person on March 28, 2016 and vested on March 1, 2017.</footnote>
        <footnote id="F13">Settlement of market stock units that were granted on February 27, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F14">Forfeiture of shares to satisfy tax obligations related to market stock units that were granted to the Reporting Person on February 27, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F15">Settlement of market stock units that were granted on June 16, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F16">Forfeiture of shares to satisfy tax obligations related to market stock units that were granted to the Reporting Person on June 16, 2014 and vested on March 1, 2017.</footnote>
        <footnote id="F17">Each restricted stock unit represents a contingent right to receive one share of WCG common stock.</footnote>
        <footnote id="F18">The award of restricted stock units vests in approximately equal increments on March 1, 2015, March 1, 2016 and March 1, 2017.  Vested shares will be delivered to the Reporting Person upon vest.</footnote>
        <footnote id="F19">The award of restricted stock units vests in approximately equal increments on March 1, 2017, March 1, 2018 and March 1, 2019.  Vested shares will be delivered to the Reporting Person upon vest.</footnote>
        <footnote id="F20">Each market stock unit represents a contingent right to receive up to two shares of WCG common stock based on the average closing price for the last thirty trading days in 2016 compared to the last thirty trading days in 2013.</footnote>
        <footnote id="F21">The market stock units vested on March 1, 2017.  Vested shares will be delivered to the Reporting Person upon vest.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Michael Haber, Attorney-in-fact</signatureName>
        <signatureDate>2017-03-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
