Organised by The Cancer Research SocietyCanada's most popular multi-day running event sees close to 50,000 participants compete in a variety of challenging races—including the country's largest marathon—along picturesque downtown routes.
Tamarack Ottawa Race Weekend 2026 · 23 May 2026 to 24 May 2026 ·
Closes 24/06/2026
For 80 years, the Cancer Research Society (CRS) has been an undisputed leader in the field of cancer research, supporting thousands of research projects.
Research is the key to outsmart cancer.
Join us on this amazing Tamarack Ottawa Race Weekend and on the journey to outsmart cancer together.
Charities pay a small fee for our service. Learn more about fees