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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-11-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001802505</rptOwnerCik>
            <rptOwnerName>Langholz Christopher Lynn</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>President International</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6585.446</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>69551.875</value>
                    <footnoteId id="F2"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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            <securityTitle>
                <value>Class A Common Stock</value>
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            <transactionDate>
                <value>2020-11-20</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>6173.856</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>75725.731</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Shares</value>
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            <transactionDate>
                <value>2020-11-20</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>26341.784</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <exerciseDate>
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            <expirationDate>
                <footnoteId id="F5"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>26341.784</value>
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            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>26341.784</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Options (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>60.74</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F6"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>33585</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2021-11-20</value>
            </exerciseDate>
            <expirationDate>
                <value>2030-11-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>33585.0</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33585</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
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    <footnotes>
        <footnote id="F1">Restricted Stock award of Class A Common Stock which vests on November 20, 2023.</footnote>
        <footnote id="F2">Includes 50,197.7672 shares of Class A Common Stock which vest on November 18, 2021; 4,278.219 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved and 6,585.446 shares of Class A Common Stock which vest on November 20, 2023.</footnote>
        <footnote id="F3">Award of restricted stock units (&quot;RSUs&quot;) which vest in equal annual increments on each of the first and second anniversary dates of the grant and become fully vested after two years. Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock.</footnote>
        <footnote id="F4">Includes 50,197.7672 shares of Class A Common Stock which vest on November 18, 2021; 4,278.219 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved; 6,173.856 RSUs which vest in equal installments on the first and second anniversary dates of the grant and become fully vested on November 20, 2022 and 6,585.446 shares of Class A Common Stock which vest on November 20, 2023.</footnote>
        <footnote id="F5">Award of performance Class A Common Stock which vests on November 20, 2023 if the performance metrics described in the applicable SIA are achieved. The performance metrics set forth in the SIA are (1) achievement of a three year (fiscal 2021-2023) cumulative operating income target and (2) a favorable comparison of the relative total shareholder return of the Issuer's Class A Common Stock compared to a predetermined peer group of publicly traded companies over a three year (fiscal 2021-2023) period. Subject to the achievement of the performance metrics, the performance shares could vest at a level of 50 to 200 percent and are reported as derivative securities at the 200 percent level. If neither of the performance metrics are achieved, the award expires.</footnote>
        <footnote id="F6">These options vest in equal annual increments on each of the first, second and third anniversary dates of the grant and become fully vested after three years.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ R. Read Hudson by Power of Attorney for Christopher Lynn Langholz</signatureName>
        <signatureDate>2020-11-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2020-11-20
0
0000100493
TYSON FOODS, INC.
TSN
0001802505
Langholz Christopher Lynn
2200 W. DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
President International
Class A Common Stock
2020-11-20
4
A
0
6585.446
0
A
69551.875
D
Class A Common Stock
2020-11-20
4
A
0
6173.856
0
A
75725.731
D
Performance Shares
2020-11-20
4
A
0
26341.784
A
Class A Common Stock
26341.784
26341.784
D
Non-Qualified Stock Options (Right to Buy)
60.74
2020-11-20
4
A
0
33585
0
A
2021-11-20
2030-11-20
Class A Common Stock
33585.0
33585
D
Restricted Stock award of Class A Common Stock which vests on November 20, 2023.
Includes 50,197.7672 shares of Class A Common Stock which vest on November 18, 2021; 4,278.219 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable Stock Incentive Agreement ("SIA") is achieved and 6,585.446 shares of Class A Common Stock which vest on November 20, 2023.
Award of restricted stock units ("RSUs") which vest in equal annual increments on each of the first and second anniversary dates of the grant and become fully vested after two years. Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock.
Includes 50,197.7672 shares of Class A Common Stock which vest on November 18, 2021; 4,278.219 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable Stock Incentive Agreement ("SIA") is achieved; 6,173.856 RSUs which vest in equal installments on the first and second anniversary dates of the grant and become fully vested on November 20, 2022 and 6,585.446 shares of Class A Common Stock which vest on November 20, 2023.
Award of performance Class A Common Stock which vests on November 20, 2023 if the performance metrics described in the applicable SIA are achieved. The performance metrics set forth in the SIA are (1) achievement of a three year (fiscal 2021-2023) cumulative operating income target and (2) a favorable comparison of the relative total shareholder return of the Issuer's Class A Common Stock compared to a predetermined peer group of publicly traded companies over a three year (fiscal 2021-2023) period. Subject to the achievement of the performance metrics, the performance shares could vest at a level of 50 to 200 percent and are reported as derivative securities at the 200 percent level. If neither of the performance metrics are achieved, the award expires.
These options vest in equal annual increments on each of the first, second and third anniversary dates of the grant and become fully vested after three years.
/s/ R. Read Hudson by Power of Attorney for Christopher Lynn Langholz
2020-11-24