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Get ready to experience the thrill of the Tamarack Homes Ottawa International Marathon, one of Canada’s most celebrated marathons for over 50 years! With breathtaking scenic routes that weave through the nation’s capital, this race offers an unforgettable backdrop for runners of all levels. The atmosphere is electric, buzzing with the energy of thousands of passionate participants and elite athletes from around the globe. As a prestigious World Athletics Elite Label Road Race, the Tamarack Homes Ottawa International Marathon promises not just a race, but a celebration of endurance, community, and the joy of running

The Tamarack Homes Ottawa International Marathon is a certified course, and is a Boston Marathon qualifying event.
Event Schedule

What are the race start times?

Saturday, May 23, 2026

Ottawa Kids Marathon – 1:00 PM
Ottawa 2K – 3:00 PM
Ottawa 5K – 4:00 PM
Elite Women’s 10K – 5:45 PM
Ottawa 10K presented by Otto’s Ottawa – 6:00 PM
Sunday, May 24

Tamarack Homes Ottawa International Marathon – 7:00 AM
Ottawa Half Marathon presented by Desjardins – 9:00 AM
Address:110 Ottawa city hall