18 February 2011

Gran Tierra Energy to host Fourth Quarter and Year-End 2010 Results Conference Call on February 25, 2011 at 10:00 A.M. Eastern Time

CALGARY, Alberta, February 18, 2011, Gran Tierra Energy Inc. (NYSE Amex: GTE, TSX: GTE), a company focused on oil exploration and production in South America, today announced that it will release its Fourth Quarter and Year-End 2010 financial and operating results the evening of Thursday, February 24, 2011 and host its Fourth Quarter and Year-End 2010 results conference call the following day at 10:00 a.m. Eastern Time (ET).

President and CEO, Dana Coffield, CFO, Martin Eden and COO, Shane O’Leary will discuss Gran Tierra Energy’s financial and operating results for the quarter and then take questions from securities analysts and institutional shareholders.

Interested parties may access the conference call by dialing 1-866-804-6924 (domestic) or

1-857-350-1670 (international), pass code 16619797. The call will also be available via web cast at www.grantierra.com, www.streetevents.com, or www.fulldisclosure.com. The web cast will be available on Gran Tierra Energy’s website until the next earnings call.

If you are unable to participate, an audio replay of the call will be available beginning two hours after the call until 11:59 p.m. on March 3, 2011. To access the replay dial 1-888-286-8010 (domestic) or 1-617-801-6888 (international) pass code 56032508.

Please connect at least 15 minutes prior to the conference call to ensure adequate time for any software to download that may be required to join the webcast.

About Gran Tierra Energy Inc.

Gran Tierra Energy Inc. is an international oil and gas exploration and production company, headquartered in Calgary, Canada, incorporated in the United States, trading on the NYSE Amex Exchange (GTE) and the Toronto Stock Exchange (GTE), and operating in South America. Gran Tierra Energy holds interests in producing and prospective properties in Argentina, Colombia and Peru, and subject to regulatory approval, Brazil. Gran Tierra Energy has a strategy that focuses on establishing a portfolio of producing properties, plus production enhancement and exploration opportunities to provide a base for future growth.

Additional information is available on Gran Tierra Energy’s website at www.grantierra.com

Contact Information

For investor and media inquiries please contact:

Jason Crumley

Director, Investor Relations