<?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>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>
        <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>239.113</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>17213.487</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>1330</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>60.08</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15883.487</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 4,489.848 shares of Class A Common Stock which vested on May 12, 2020; 2,361.395 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; 4,353.473 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,292.189 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 3,658.577 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">On May 12, 2020, 4,489.848 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, 1,330 shares were sold by the Reporting Person to the Issuer to satisfy tax withholding obligations.</footnote>
        <footnote id="F4">Includes 2,361.395 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; 4,353.473 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,292.189 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 3,658.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ R. Read Hudson by Power of Attorney for Justin Whitmore</signatureName>
        <signatureDate>2020-05-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
[{"type": "4", "sequence": "1", "filename": "wf-form4_158948271749175.xml", "description": "FORM 4", "secsgml_size_bytes": 6794}]
X0306
4
2020-03-16
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
2020-03-16
4
J
0
239.113
0
A
17213.487
D
Class A Common Stock
2020-05-12
4
F
0
1330
60.08
D
15883.487
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 4,489.848 shares of Class A Common Stock which vested on May 12, 2020; 2,361.395 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; 4,353.473 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,292.189 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 3,658.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved.
On May 12, 2020, 4,489.848 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, 1,330 shares were sold by the Reporting Person to the Issuer to satisfy tax withholding obligations.
Includes 2,361.395 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; 4,353.473 shares of Class A Common Stock which vest on November 29, 2021 if the performance metric described in the applicable SIA is achieved; 2,292.189 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 3,658.577 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved.
/s/ R. Read Hudson by Power of Attorney for Justin Whitmore
2020-05-14