Races›Canada›Ontario›Oct 2027

Race calendar · Ontario

Running races in Ontario in Oct 2027

31 races across Ontario in Oct 2027. Your next race, seen from above.

31 races in date order

Toronto Women's Fall 8K/5K
October 2027 · Toronto, ON · 8K · 5K

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5 Peaks Heart Lake
October 2027 · Brampton, ON · Grit 22.5K · Enduro 14.6K · Sport 7.5K
Singletrack loops through Heart Lake Conservation Area

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Run for the Cure Burlington-Hamilton-Oakville
October 2027 · Burlington, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Peterborough
October 2027 · Peterborough, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Brampton
October 2027 · Brampton, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure London
October 2027 · London, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Oakville 21.1
October 2027 · Oakville, ON · Half Marathon · 10K · 5K
A flat, fast half along Lake Ontario's shoreline

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Run for the Cure Sault Ste. Marie
October 2027 · Sault Ste. Marie, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Durham Region
October 2027 · Oshawa, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Simcoe
October 2027 · Simcoe, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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The Hustle at Pinehurst
October 2027 · Ayr, ON · 50K · 25K · 12.5K
Loops through Pinehurst Lake Conservation Area

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Run for the Cure Thunder Bay
October 2027 · Thunder Bay, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Chatham-Kent
October 2027 · Chatham-Kent, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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The County Marathon
October 2027 · Picton, ON · Marathon · Marathon Relay · Half Marathon · 5K
Through Prince Edward County's vineyards and farmland

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Run for the Cure Woodbridge-Vaughan
October 2027 · Vaughan, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Kitchener-Waterloo-Cambridge
October 2027 · Kitchener, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Toronto
October 2027 · Toronto, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Richmond Hill-Markham
October 2027 · Richmond Hill, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Mississauga
October 2027 · Mississauga, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Kingston
October 2027 · Kingston, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Muskoka Marathon
October 2027 · Bracebridge, ON · Marathon · Half Marathon · 10K · 5K

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Run for the Cure Ottawa-Gatineau
October 2027 · Ottawa, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Sudbury
October 2027 · Sudbury, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure Niagara Region
October 2027 · St. Catharines, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Run for the Cure North Bay
October 2027 · North Bay, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Barrie-Orillia
October 2027 · Barrie, ON · 5K · 1K
Part of Canada's nationwide CIBC Run for the Cure

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Run for the Cure Windsor
October 2027 · Windsor, ON · 5K · 1K
One-day, nationwide 1K/5K for breast cancer research

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Sticks n' Stones Trail Race
October 2027 · Dundas, ON · 53K · 26K · 10K · 5K
Runs through Dundas Valley's Carolinian forest

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Thornbury Turkey Trot
October 2027 · Thornbury, ON · 21K · 10K · 5K

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Creemore Vertical Challenge
October 2027 · Creemore, ON · 80K · 55K · 27.5K · 14K
A climb-heavy ultra through the Creemore hills

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Toronto Waterfront Marathon
October 2027 · Toronto, ON · Marathon · Half Marathon · 5K
Canada's biggest marathon, flat along Lake Ontario

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