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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-02-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000100493</issuerCik>
        <issuerName>TYSON FOODS, INC.</issuerName>
        <issuerTradingSymbol>TSN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001415534</rptOwnerCik>
            <rptOwnerName>King Donnie</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2200 W DON TYSON PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPRINGDALE</rptOwnerCity>
            <rptOwnerState>AR</rptOwnerState>
            <rptOwnerZipCode>72762</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Group President International</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-02-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>23068.051</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>51268.051</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-02-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>32954.358</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>84222.409</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>950</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Joint IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Award of Class A Common Stock which vests on February 13, 2021 if the performance goal described in the applicable Stock Incentive Award Agreement (the &quot;SIA&quot;) is achieved. The performance goal is the achievement of a cumulative adjusted operating income target as set forth in the SIA.  If the performance goal is not achieved, the award expires.</footnote>
        <footnote id="F2">Includes 23,068.051 shares of Class A Common Stock which vest on February 13, 2021 if the performance goal described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved.</footnote>
        <footnote id="F3">Award of Class A Common Stock which vests on February 13, 2022 if the performance goal described in the applicable Stock Incentive Agreement (SIA) is achieved and the Reporting Person is employed by the Issuer on the vesting date. The performance goal is the achievement of a cumulative adjusted operating income target as set forth in the SIA. If the performance goal is not achieved or the Reporting Person is not employed by the Issuer on the vesting date, the award expires.</footnote>
        <footnote id="F4">Includes 23,068.051 shares of Class A Common Stock which vest on February 13, 2021 if the performance goal described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved and 32,954.358 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by Issuer on the vesting date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Donnie King</signatureName>
        <signatureDate>2019-02-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2019-02-13
0
0000100493
TYSON FOODS, INC.
TSN
0001415534
King Donnie
2200 W DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
Group President International
Class A Common Stock
2019-02-13
4
A
0
23068.051
0
A
51268.051
D
Class A Common Stock
2019-02-13
4
A
0
32954.358
0
A
84222.409
D
Class A Common Stock
950
I
Joint IRA
Award of Class A Common Stock which vests on February 13, 2021 if the performance goal described in the applicable Stock Incentive Award Agreement (the "SIA") is achieved. The performance goal is the achievement of a cumulative adjusted operating income target as set forth in the SIA.  If the performance goal is not achieved, the award expires.
Includes 23,068.051 shares of Class A Common Stock which vest on February 13, 2021 if the performance goal described in the applicable Stock Incentive Agreement ("SIA") is achieved.
Award of Class A Common Stock which vests on February 13, 2022 if the performance goal described in the applicable Stock Incentive Agreement (SIA) is achieved and the Reporting Person is employed by the Issuer on the vesting date. The performance goal is the achievement of a cumulative adjusted operating income target as set forth in the SIA. If the performance goal is not achieved or the Reporting Person is not employed by the Issuer on the vesting date, the award expires.
Includes 23,068.051 shares of Class A Common Stock which vest on February 13, 2021 if the performance goal described in the applicable Stock Incentive Agreement ("SIA") is achieved and 32,954.358 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by Issuer on the vesting date.
/s/ Donnie King
2019-02-15