Tamarack Ottawa International Marathon
30 May 2027 · Ottawa, Canada
Enter on the race websiteThe marathon starts at Ottawa City Hall on Laurier Avenue West. It is a certified course and a Boston Marathon qualifier, with kilometre markers throughout, water stations about every 3K, nutrition stops at 8.5, 22 and 32.5 km, and cooling and misting stations. You are expected to reach the 27 km marker in the Pretoria Bridge area by 11:30 am and finish within seven hours. Strollers are not allowed. The marathon sits within a race weekend that also includes a half marathon, 10K and 5K.
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Course
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