Tamarack Ottawa Race Weekend 2027

The Tamarack Ottawa Race Weekend is Canada's largest multi-day running festival, drawing tens of thousands of participants each year. Since its inception in 1975, the event has evolved from a small local race into a world-class running celebration, featuring six core races: the Tamarack Homes Ottawa International Marathon, Ottawa Half Marathon presented by Desjardins, Ottawa 10K presented by Otto's Ottawa, Ottawa 5K, Ottawa 2K, and Ottawa Kids Marathon.

The courses wind through the heart of Ottawa, showcasing iconic landmarks such as the Rideau Canal and Parliament Buildings. The marathon route is certified, Boston qualifying, and known for a scenic course through the National Capital Region, while the 10K attracts an elite field and hosts the 2027 Canadian 10K Championships.

Beyond the races, the weekend features a lively health and fitness expo, entertainment, charity fundraising, and challenge options for runners taking on multiple events. The Tamarack Ottawa Race Weekend is a highlight of the Canadian running calendar, offering a memorable experience for runners and walkers across ages and abilities.