Running races in Ontario in May 2027

8 races in date order

Rugged Raccoon Trail Races
May 2027 · St. Marys, ON · 50K · 25K

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Toronto Marathon
May 2027 · Toronto, ON · Marathon · Half Marathon · 10K · 5K

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Conquer The Canuck
May 2027 · Cambridge, ON · 50K · 25K · 12.5K

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Sporting Life 10K
May 2027 · Toronto, ON · 10K
Toronto's biggest 10K, raising millions for sick kids

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Sulphur Springs Trail Race
May 2027 · Ancaster, ON · 100 Mile · 100K · 50 Mile · 50K · 10K
Trail ultras through Hamilton's Dundas Valley

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Toronto Women's Spring 10K/5K
May 2027 · Toronto, ON · 10K · 5K

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SudburyROCKS!!! Marathon
May 2027 · Sudbury, ON · Marathon · Half Marathon · 10K · 5K
Named for Sudbury's rocky Canadian Shield terrain

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Tamarack Ottawa Race Weekend
Sun 30 May 2027 · Ottawa, ON · Marathon · Half Marathon · 10K · 5K · 2K
Past Parliament Hill and along the Rideau Canal

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← Ontario Oct Nov Feb 2027 Apr 2027 Jun 2027 Jul 2027 Aug 2027 Sep 2027 Oct 2027

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Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.