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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-03-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001785802</rptOwnerCik>
            <rptOwnerName>O'Mara Noelle</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 Prepared Foods</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-03-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>91.829</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12055.978</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>2020-05-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>443</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>60.08</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11612.978</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></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 1,509.889 shares which vested on May 12, 2020; 1,012.027 shares of Class A Common Stock which vest on November 17, 2020; 1,306.041 shares of Class A Common Stock which vest on November 19, 2021; 1,267.746 shares of Class A Common stock which vest on May 10, 2022; 4,187.443 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 1,473.98 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="F3">On May 12, 2020, 1,509.889 shares of restricted Class A Common Stock vested. These shares were previously reported as beneficially owned by the Reporting Person. Pursuant to an election made by the Reporting Person, 443 shares were sold by the Reporting Person to the Issuer to satisfy tax withholding obligations.</footnote>
        <footnote id="F4">Includes 1,012.027 shares of Class A Common Stock which vest on November 17, 2020; 1,306.041 shares of Class A Common Stock which vest on November 19, 2021; 1,267.746 shares of Class A Common stock which vest on May 10, 2022; 4,187.443 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 1,473.98 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ R. Read Hudson by Power of Attorney for Noelle O'Mara</signatureName>
        <signatureDate>2020-05-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2020-03-16
0
0000100493
TYSON FOODS, INC.
TSN
0001785802
O'Mara Noelle
2200 W DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
Group President Prepared Foods
Class A Common Stock
2020-03-16
4
J
0
91.829
0
A
12055.978
D
Class A Common Stock
2020-05-12
4
F
0
443
60.08
D
11612.978
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 1,509.889 shares which vested on May 12, 2020; 1,012.027 shares of Class A Common Stock which vest on November 17, 2020; 1,306.041 shares of Class A Common Stock which vest on November 19, 2021; 1,267.746 shares of Class A Common stock which vest on May 10, 2022; 4,187.443 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 1,473.98 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.
On May 12, 2020, 1,509.889 shares of restricted Class A Common Stock vested. These shares were previously reported as beneficially owned by the Reporting Person. Pursuant to an election made by the Reporting Person, 443 shares were sold by the Reporting Person to the Issuer to satisfy tax withholding obligations.
Includes 1,012.027 shares of Class A Common Stock which vest on November 17, 2020; 1,306.041 shares of Class A Common Stock which vest on November 19, 2021; 1,267.746 shares of Class A Common stock which vest on May 10, 2022; 4,187.443 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 1,473.98 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.
/s/ R. Read Hudson by Power of Attorney for Noelle O'Mara
2020-05-14