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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-09-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001415534</rptOwnerCik>
            <rptOwnerName>King Donnie</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>Grp Pres Intl &amp; Chief Adm Off</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-11-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1624.5712</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2307.1398</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Employee Stock Purchase Plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-09-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2270.743</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>119783.288</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <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="F4"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11112.94</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>130896.228</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <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="F6"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11195.258</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>142091.486</value>
                    <footnoteId id="F7"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>950</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Joint IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F8"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>44451.76</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F8"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F8"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>44451.76</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>44451.76</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>60.74</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F9"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>56675</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>56675.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>56675</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 purchased for the Reporting Person's account under the Issuer's Employee Stock Purchase 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 16b-3.</footnote>
        <footnote id="F2">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="F3">Includes 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable Stock Incentive Agreement (&quot;SIA&quot;) is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by Issuer on the vesting date; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved and 7,700.794 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="F4">Restricted Stock award of Class A Common Stock which vests on November 20, 2023.</footnote>
        <footnote id="F5">Includes 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved; 7,700.794 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved and 11,112.94 shares of Class A Common Stock which vest on November 20, 2023.</footnote>
        <footnote id="F6">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="F7">Includes 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metrics described in the applicable SIA are achieved; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved; 7,700.794 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved; 11,195.258 RSUs which vest in equal annual installments on each of the first and second anniversary dates of the grant and become fully vested on November 20, 2022; and 11,112.94 shares of Class A Common Stock which vest on November 20, 2023.</footnote>
        <footnote id="F8">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="F9">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 Donnie King</signatureName>
        <signatureDate>2020-11-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2020-09-16
0
0000100493
TYSON FOODS, INC.
TSN
0001415534
King Donnie
2200 W DON TYSON PARKWAY
SPRINGDALE
AR
72762
0
1
0
0
Grp Pres Intl & Chief Adm Off
Class A Common Stock
2020-11-12
4
J
0
1624.5712
0
A
2307.1398
I
Employee Stock Purchase Plan
Class A Common Stock
2020-09-16
4
J
0
2270.743
0
A
119783.288
D
Class A Common Stock
2020-11-20
4
A
0
11112.94
0
A
130896.228
D
Class A Common Stock
2020-11-20
4
A
0
11195.258
0
A
142091.486
D
Class A Common Stock
950
I
Joint IRA
Performance Shares
2020-11-20
4
A
0
44451.76
A
Class A Common Stock
44451.76
44451.76
D
Non-Qualified Stock Options (Right to Buy)
60.74
2020-11-20
4
A
0
56675
0
A
2021-11-20
2030-11-20
Class A Common Stock
56675.0
56675
D
Represents shares of the Issuer's Class A Common Stock purchased for the Reporting Person's account under the Issuer's Employee Stock Purchase 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 16b-3.
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 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable Stock Incentive Agreement ("SIA") is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved and the Reporting Person is employed by Issuer on the vesting date; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved and 7,700.794 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved.
Restricted Stock award of Class A Common Stock which vests on November 20, 2023.
Includes 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved; 7,700.794 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved and 11,112.94 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 24,029.041 shares of Class A Common Stock which vest on February 13, 2022 if the performance metric described in the applicable SIA is achieved; 34,327.2 shares of Class A Common Stock which vest on February 13, 2022 if the performance metrics described in the applicable SIA are achieved; 4,646.042 shares of Class A Common Stock which vest on May 10, 2022 if the performance metric described in the applicable SIA is achieved; 17,112.875 shares of Class A Common Stock which vest on November 18, 2021 if the performance metric described in the applicable SIA is achieved; 7,700.794 shares of Class A Common Stock which vest on November 18, 2022 if the performance metric described in the applicable SIA is achieved; 11,195.258 RSUs which vest in equal annual installments on each of the first and second anniversary dates of the grant and become fully vested on November 20, 2022; and 11,112.94 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 Donnie King
2020-11-24