<?xml version="1.0"?>
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    <schemaVersion>X0306</schemaVersion>

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

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001721646</rptOwnerCik>
            <rptOwnerName>Whitmore Justin</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 Alternative Proteins</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
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            </transactionDate>
            <transactionCoding>
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                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                    <footnoteId id="F2"/>
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            <ownershipNature>
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                    <value>D</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
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            <transactionDate>
                <value>2019-11-18</value>
            </transactionDate>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                    <value>16974.374</value>
                    <footnoteId id="F4"/>
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                    <value>D</value>
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    <derivativeTable>
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            <securityTitle>
                <value>Performance Shares</value>
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            <transactionDate>
                <value>2019-11-18</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>14447.656</value>
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                <transactionPricePerShare>
                    <footnoteId id="F5"/>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>14447.656</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14447.656</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="F6"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>19392</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>19392.0</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>19392</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 4,470.283 shares of Class A Common Stock which vest on May 12, 2020 if the Reporting Person is employed by the Issuer on the vesting date; 2,331.277 shares which vest on November 13, 2020 if the performance metric described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved and the Reporting Person is employed by the Issuer on the vesting date; 4,297.947 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved and 2,262.953 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, 2022 if the performance metric described in the applicable Stock Incentive Award Agreement (the &quot;SIA&quot;) 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="F4">Includes 4,470.283 shares of Class A Common Stock which vest on May 12, 2020 if the Reporting Person is employed by the Issuer on the vesting date; 2,331.277 shares which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by the Issuer on the vesting date; 4,297.947 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,262.953 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved and and 3,611.914 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="F5">Award of performance Class A Common Stock which vests on November 18, 2022 if the performance metrics described in the applicable Stock Incentive Agreement (the &quot;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="F6">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/ R. Read Hudson by Power of Attorney for Justin Whitmore</signatureName>
        <signatureDate>2019-11-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2019-09-16
0
0000100493
TYSON FOODS, INC.
TSN
0001721646
Whitmore Justin
2200 W DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
EVP Alternative Proteins
Class A Common Stock
2019-09-16
4
J
0
124.667
0
A
13362.46
D
Class A Common Stock
2019-11-18
4
A
0
3611.914
0
A
16974.374
D
Performance Shares
2019-11-18
4
A
0
14447.656
A
Class A Common Stock
14447.656
14447.656
D
Non-Qualified Stock Options (Right to Buy)
89.98
2019-11-18
4
A
0
19392
0
A
2020-11-18
2029-11-18
Class A Common Stock
19392.0
19392
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 4,470.283 shares of Class A Common Stock which vest on May 12, 2020 if the Reporting Person is employed by the Issuer on the vesting date; 2,331.277 shares which vest on November 13, 2020 if the performance metric described in the applicable Stock Incentive Agreement ("SIA") is achieved and the Reporting Person is employed by the Issuer on the vesting date; 4,297.947 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved and 2,262.953 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, 2022 if the performance metric described in the applicable Stock Incentive Award Agreement (the "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 4,470.283 shares of Class A Common Stock which vest on May 12, 2020 if the Reporting Person is employed by the Issuer on the vesting date; 2,331.277 shares which vest on November 13, 2020 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by the Issuer on the vesting date; 4,297.947 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,262.953 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved and and 3,611.914 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 performance Class A Common Stock which vests on November 18, 2022 if the performance metrics described in the applicable Stock Incentive Agreement (the "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/ R. Read Hudson by Power of Attorney for Justin Whitmore
2019-11-20