Running races in Ontario in Sep 2027

15 races in date order

TO50
Sat 4 Sep 2027 · Toronto, ON · 50 miles · 50 km
Self-supported 50 km through Toronto's streets, deposit back at the line if you finish

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Georgina Marathon
September 2027 · Pefferlaw, ON · Marathon · Half Marathon · 10 km · 5 km

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The Soo 200
September 2027 · Sault Ste. Marie, ON · 200 Mile

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ZooRun
September 2027 · Toronto, ON · 10K · 5K
Runs through the grounds of the Toronto Zoo

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Run For London
September 2027 · London, ON · 10K · 5K · 3K · 1K Family Fun Walk
Charity 10K through Springbank Park in London, Ontario

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Haliburton Forest Trail Race
September 2027 · Haliburton, ON · 100 Mile · 50 Mile · 50K · 26K · 12K
Trails through Haliburton Forest's private reserve

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North Bay Road Race
September 2027 · North Bay, ON · Half Marathon · 10K · 5K

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Longboat Toronto Island Run
September 2027 · Toronto, ON · 10K · 5K
Car-free Toronto Islands, reached only by ferry

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Monster of Mazinaw
September 2027 · Cloyne, ON · 60K · 43K · 30K
Named for Bon Echo's towering Mazinaw Rock

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Monarch Ultra 10km
September 2027 · Peterborough, ON · 10K
A 10K run for monarch butterfly conservation

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Constantine Yorkville Run
September 2027 · Toronto, ON · 5K
Closes Toronto's chic Bloor-Yorkville strip for a 5K

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Canada Army Run
September 2027 · Ottawa, ON · Half Marathon · 10K · 5K
Canada's largest military-tribute road race

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Ultra Trail Stokely Creek
September 2027 · Algoma Mills, ON · 170.9 km · 85.5 km · 56.4 km · 34.4 km · 17 km · 5 km
A rugged wilderness ultra through Northern Ontarios backcountry

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Blue Bully Ultra
September 2027 · The Blue Mountains, ON · The Drive 50K · The Drive 25K · The Stampede 5K
Ski trails become an ultra course at Blue Mountain

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Big Little Run
September 2027 · Guelph, ON · Half Marathon · 10K · 5K

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← Ontario Oct Nov Feb 2027 Apr 2027 May 2027 Jun 2027 Jul 2027 Aug 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.