<SUBMISSION>
<ACCESSION-NUMBER>0000315189-06-000051
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20060518
<FILING-DATE>20060522
<DATE-OF-FILING-DATE-CHANGE>20060522
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>DEERE & CO
<CIK>0000315189
<ASSIGNED-SIC>3523
<IRS-NUMBER>362382580
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1031
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>ONE JOHN DEERE PLACE
<CITY>MOLINE
<STATE>IL
<ZIP>61265-8098
<PHONE>(309) 765-5688
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>ONE JOHN DEERE PLACE
<CITY>MOLINE
<STATE>IL
<ZIP>61265-8098
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>LANE ROBERT W
<CIK>0001055707
<ASSIGNED-SIC>3523
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1031
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-04121
<FILM-NUMBER>06857380
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>ONE JOHN DEERE PLACE
<CITY>MOLINE
<STATE>IL
<ZIP>61265
<PHONE>3097654703
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>DEERE & COMPANY
<STREET2>ONE JOHN DEERE PLACE
<CITY>MOLINE
<STATE>IL
<ZIP>61265
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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<ownershipDocument>

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    <periodOfReport>2006-05-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
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        <issuerName>DEERE &amp; CO</issuerName>
        <issuerTradingSymbol>DE</issuerTradingSymbol>
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            <rptOwnerName>LANE ROBERT W</rptOwnerName>
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        <reportingOwnerAddress>
            <rptOwnerStreet1>DEERE &amp; COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>ONE JOHN DEERE PLACE</rptOwnerStreet2>
            <rptOwnerCity>MOLINE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>61265</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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    <derivativeTable>
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            <securityTitle>
                <value>Employee Priced Options</value>
                <footnoteId id="F5"/>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2002-12-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2009-12-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-05-18</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2010-12-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>215565</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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    <footnotes>
        <footnote id="F1">References to Deere &amp; Company common stock include associated preferred stock rights.</footnote>
        <footnote id="F2">Exercise of Rule 16b-3 employee stock options pursuant to a Rule 10b5-1 trading plan adopted on February 28, 2006, and related delivery and withholding of shares to pay the option exercise prices and withholding taxes.</footnote>
        <footnote id="F3">Sales effected pursuant to a Rule 10b5-1 trading plan adopted on February 28, 2006.</footnote>
        <footnote id="F4">Includes 245,621 restricted stock units granted under the John Deere Omnibus Equity and Incentive Plan.</footnote>
        <footnote id="F5">All options include the ability to withhold shares upon the exercise of the option to satisfy income tax obligations.</footnote>
        <footnote id="F6">The options became exercisable in three approximately equal installments on December 13, 2001, December 13, 2002, and December 13, 2003.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Paul Wilczynski, Assistant Corporate Secretary, Deere &amp; Company, Under Power of Attorney</signatureName>
        <signatureDate>2006-05-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
