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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KPiFqnL2uojHktia3jr/UOnFJwRmxUn5APVpCBhbEXtrVeDjUUUgjSZQuGrVQCav
 7b2odu1LIG4mEiks+rPX7g==

<SEC-DOCUMENT>0001209191-08-049366.txt : 20080827
<SEC-HEADER>0001209191-08-049366.hdr.sgml : 20080827
<ACCEPTANCE-DATETIME>20080827173510
ACCESSION NUMBER:		0001209191-08-049366
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080822
FILED AS OF DATE:		20080827
DATE AS OF CHANGE:		20080827

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TERRA INDUSTRIES INC
		CENTRAL INDEX KEY:			0000722079
		STANDARD INDUSTRIAL CLASSIFICATION:	AGRICULTURE CHEMICALS [2870]
		IRS NUMBER:				521145429
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		600 FOURTH ST
		STREET 2:		PO BOX 6000
		CITY:			SIOUX CITY
		STATE:			IA
		ZIP:			51102-6000
		BUSINESS PHONE:		7122771340

	MAIL ADDRESS:	
		STREET 1:		600 FOURTH STREET
		STREET 2:		PO BOX 6000
		CITY:			SIOUX CITY
		STATE:			IA
		ZIP:			51102-6000

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INSPIRATION RESOURCES CORP
		DATE OF NAME CHANGE:	19920517

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SLACK HENRY R
		CENTRAL INDEX KEY:			0001192331

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08520
		FILM NUMBER:		081042883

	BUSINESS ADDRESS:	
		STREET 1:		101 WOOD AVE.
		CITY:			ISELIN
		STATE:			NJ
		ZIP:			08830
		BUSINESS PHONE:		732 205 5000

	MAIL ADDRESS:	
		STREET 1:		101WOOD AV ENUE
		CITY:			ISELIN
		STATE:			NJ
		ZIP:			08830
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-22</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000722079</issuerCik>
        <issuerName>TERRA INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>TRA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001192331</rptOwnerCik>
            <rptOwnerName>SLACK HENRY R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>600 FOURTH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 6000</rptOwnerStreet2>
            <rptOwnerCity>SIOUX CITY</rptOwnerCity>
            <rptOwnerState>IA</rptOwnerState>
            <rptOwnerZipCode>51102-6000</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>40000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>49.8016</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>41900</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Debra J. Bliven, by Power of Attorney for Henry R. Slack</signatureName>
        <signatureDate>2008-08-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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