Tamarack Ottawa Race Weekend

The Tamarack Ottawa International Marathon takes place in August 2026 across a flat to gently rolling trail course that covers 42.2 kilometers through Ottawa, Canada. The terrain is forgiving for a trail marathon, with minimal elevation change that won't punish your legs on race day. Beyond the race itself, the event offers a full weekend experience including a 10K, half marathon, and various shorter distances, plus recovery zones, an expo, and a beer garden if you're looking to celebrate after finishing. Medical services and safety support are in place throughout the event, and you can download the official app to help with logistics and training prep. This is a well-organized event backed by sponsors like Desjardins and Otto's, so you can expect solid infrastructure and support stations along the way.