<SEC-DOCUMENT>0001668221-25-000002.txt : 20250103
<SEC-HEADER>0001668221-25-000002.hdr.sgml : 20250103
<ACCEPTANCE-DATETIME>20250103171712
ACCESSION NUMBER:		0001668221-25-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250101
FILED AS OF DATE:		20250103
DATE AS OF CHANGE:		20250103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Trimble Todd Allan
		CENTRAL INDEX KEY:			0001668221
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-15087
		FILM NUMBER:		25507851

	MAIL ADDRESS:	
		STREET 1:		901 HEARTLAND WAY
		CITY:			NORTH LIBERTY
		STATE:			IA
		ZIP:			52317

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HEARTLAND EXPRESS INC
		CENTRAL INDEX KEY:			0000799233
		STANDARD INDUSTRIAL CLASSIFICATION:	TRUCKING (NO LOCAL) [4213]
		ORGANIZATION NAME:           	01 Energy & Transportation
		IRS NUMBER:				930926999
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		901 HEARTLAND WAY
		CITY:			NORTH LIBERTY
		STATE:			IA
		ZIP:			52317
		BUSINESS PHONE:		3196457060

	MAIL ADDRESS:	
		STREET 1:		901 HEARTLAND WAY
		CITY:			NORTH LIBERTY
		STATE:			IA
		ZIP:			52317
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1735942625.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-01-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000799233</issuerCik>
        <issuerName>HEARTLAND EXPRESS INC</issuerName>
        <issuerTradingSymbol>HTLD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001668221</rptOwnerCik>
            <rptOwnerName>Trimble Todd Allan</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 HEARTLAND WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORTH LIBERTY</rptOwnerCity>
            <rptOwnerState>IA</rptOwnerState>
            <rptOwnerZipCode>52317</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP of Safety and Security</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13453</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>83</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.96</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13370</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person received 1,000 restricted shares of Heartland Express, Inc. common stock as an award under the 2021 Restricted Stock Plan, of which 250 shares immediately vested, 250 shares will vest on April 1, 2025, 250 shares will vest on July 1, 2025, and 250 shares will vest on October 1, 2025. The award is subject to certain other vesting and forfeiture provisions.</footnote>
        <footnote id="F2">Represents the number of shares deemed withheld to satisfy tax withholding obligations upon vesting of restricted stock granted to the reporting person.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Todd A. Trimble, by Christopher A. Strain, attorney-in-fact, pursuant to POA previously filed</signatureName>
        <signatureDate>2025-01-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
