Canadian Oil Sands Trust files its year end continuous disclosure documents

NEWS RELEASE For immediate release

Canadian Oil Sands Trust files its year end continuous disclosure documents

Calgary, AB., March 26, 2010 (TSX – COS.UN) — Canadian Oil Sands Trust (the “Trust”) today filed with Canadian securities authorities the Trust’s Annual Information Form for the year ended December 31, 2009, including disclosure and reports relating to reserves data and other oil and gas information pursuant to National Instrument 51-101. The Trust previously filed its audited consolidated annual financial statements and related disclosure documents on March 15, 2010. Copies of these filed documents may be obtained through www.sedar.com, the Trust’s website at www.cos-trust.com, or by emailing the Trust at [email protected].

Canadian Oil Sands Trust is an open-ended investment trust that generates income from its indirect 36.74 per cent working interest in the Syncrude Joint Venture. The Trust currently has approximately 484.4 million units outstanding, which trade on the Toronto Stock Exchange under the symbol COS.UN. The Trust is managed by Canadian Oil Sands Limited.

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Canadian Oil Sands Limited For further information: Marcel Coutu Siren Fisekci President & Chief Executive Officer VP, Investor and Corporate Relations: (403) 218-6228

Units Listed – Symbol: COS.UN

[email protected] Toronto Stock Exchange Web site: www.cos-trust.com