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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-09-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001725741</rptOwnerCik>
            <rptOwnerName>Tu Amy</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>EVP &amp; General Counsel</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-09-16</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionAmounts>
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                    <value>98.616</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11088.287</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>2019-11-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>16670.371</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27758.658</value>
                    <footnoteId id="F4"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-11-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F5"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>4723.272</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>32481.93</value>
                    <footnoteId id="F6"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
                <value>2019-11-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>18893.088</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F7"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F7"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>18893.088</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18893.088</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Options (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>89.98</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-11-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F8"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25358</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2020-11-18</value>
            </exerciseDate>
            <expirationDate>
                <value>2029-11-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25358.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25358</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of the Issuer's Class A Common Stock received by the Reporting Person pursuant to the Issuer's dividend reinvestment plan since the last Statement of Changes in Beneficial Ownership was filed by the Reporting Person.  Such acquisitions are exempt from Section 16 concurrent reporting requirements pursuant to Rule 16a-11.</footnote>
        <footnote id="F2">Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved and 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved.</footnote>
        <footnote id="F3">Award of Class A Common Stock which vests on November 18, 2021 if the performance metric described in the applicable SIA is achieved. The performance metric is the achievement of a two year (fiscal 2020-2021) cumulative adjusted operating income target as set forth in the SIA. If the performance metric is not achieved, the award expires.</footnote>
        <footnote id="F4">Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved and 16,670.371 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved.</footnote>
        <footnote id="F5">Award of Class A Common Stock which vests on November 18, 2022 if the performance metric described in the applicable SIA is achieved. The performance metric is the achievement of a three year (fiscal 2020-2022) cumulative adjusted operating income target as set forth in the SIA. If the performance metric is not achieved, the award expires.</footnote>
        <footnote id="F6">Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 16,670.371 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved and 4,723.272 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.</footnote>
        <footnote id="F7">Award of performance Class A Common Stock which vests on November 18, 2022 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 2020-2022) 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 2020-2022) 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="F8">The stock options vest at 33 1/3 percent on each of the first, second, and third anniversary dates of the grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Amy Tu</signatureName>
        <signatureDate>2019-11-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2019-09-16
0
0000100493
TYSON FOODS, INC.
TSN
0001725741
Tu Amy
2200 W DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
EVP & General Counsel
Class A Common Stock
2019-09-16
4
J
0
98.616
0
A
11088.287
D
Class A Common Stock
2019-11-18
4
A
0
16670.371
0
A
27758.658
D
Class A Common Stock
2019-11-18
4
A
0
4723.272
0
A
32481.93
D
Performance Shares
2019-11-18
4
A
0
18893.088
A
Class A Common Stock
18893.088
18893.088
D
Non-Qualified Stock Options (Right to Buy)
89.98
2019-11-18
4
A
0
25358
0
A
2020-11-18
2029-11-18
Class A Common Stock
25358.0
25358
D
Represents shares of the Issuer's Class A Common Stock received by the Reporting Person pursuant to the Issuer's dividend reinvestment plan since the last Statement of Changes in Beneficial Ownership was filed by the Reporting Person.  Such acquisitions are exempt from Section 16 concurrent reporting requirements pursuant to Rule 16a-11.
Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable Stock Incentive Agreement ("SIA") is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved and 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved.
Award of Class A Common Stock which vests on November 18, 2021 if the performance metric described in the applicable SIA is achieved. The performance metric is the achievement of a two year (fiscal 2020-2021) cumulative adjusted operating income target as set forth in the SIA. If the performance metric is not achieved, the award expires.
Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved and 16,670.371 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved.
Award of Class A Common Stock which vests on November 18, 2022 if the performance metric described in the applicable SIA is achieved. The performance metric is the achievement of a three year (fiscal 2020-2022) cumulative adjusted operating income target as set forth in the SIA. If the performance metric is not achieved, the award expires.
Includes 3,819.586 shares of Class A Common Stock which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved; 6,017.124 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 1,251.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 16,670.371 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved and 4,723.272 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.
Award of performance Class A Common Stock which vests on November 18, 2022 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 2020-2022) 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 2020-2022) 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.
The stock options vest at 33 1/3 percent on each of the first, second, and third anniversary dates of the grant.
/s/ Amy Tu
2019-11-20