Half marathons in Ontario
78 upcoming half marathons across Ontario, with the deepest fields in Toronto, Hamilton, Niagara Falls. Next up: Roots and Rocks Trail Run on August 16, 2026.
Updated daily — every listing links to the organizer's official registration page.
78 races listed
Roots and Rocks Trail RunReg closes soon
Greater Sudbury, ON · Trail · 3km / 5km / 10km / 21km
Mudskipper Canadian SwimRun Championships - Milton and the Milton Open Water SwimReg closes soon
Milton, ON · Trail · 10km / 20km / 1500m / 3km
Caffeine Run Toronto (Hamilton)
Hamilton, ON · Road running · 5km / 10km / 21km
24 Hour To Empower Running Challenge
Barrie, ON · Road running · 5km / 10km / 15km / 20km
Caffeine Run London
London, ON · Road running · 5km / 10km / 21km
Save the Bees Virtual RunDate TBA
Toronto, ON · Road running · 1mi / 5km / 10km / 21km
North Bay Road Race 2026
North Bay, ON · Road running · 5km / 10km / 21km / 1mi
Georgina Marathon & Half-Marathon
Jacksons Point, ON · Road running · 42km / 10km / 21km / 5km
WINDSOR WATERFRONT HALF MARATHON & 5KM
Windsor, ON · Road running · 21km / 5km
Sudbury Masters Ramsey Tour 2026
Greater Sudbury, ON · Road running · 21km / 5km
Canada Army Run 2026 / Course de l’Armée du Canada : 2026
Ottawa, ON · Road running · 5km / 10km / 21km / 15km
Habitat for Humanity Chatham-Kent River Run
Chatham, ON · Road running · 5km / 10km / 21km
Milton Open Water Swim and SwimRun ChallengeDate TBA
Milton, ON · Swim · 10km / 20km / 1500m / 3km
Big Little Run 2026
Guelph, ON · Road running · 5km / 10km / 21km
Run4Health 2026
Walkerton, ON · Road running · 1km / 5km / 10km / 21km
Railway City Road Races 2026 Live Run
St Thomas, ON · Road running · 5km / 10km / 21km / 1km
Run for the Grapes Half Marathon & 5K
Lincoln, ON · Road running · 5km / 21km
Springbank Road Races London
London, ON · Road running · 21km / 5km / 250m / 2km
Great Rift Community Half Marathon
Hamilton, ON · Road running · 5km / 21km
ELEVATE, Blue Mountain - Trail Elevation ChallengeDate TBA
Grey County, ON · Trail · 5km / 10km / 1km / 2km
Albion Ascent Trail RaceDate TBA
Hamilton, ON · Trail · 5km / 10km / 21km / 1km
PHM Run for the Residents
Markham, ON · Road running · 21km / 6km
Oakville 21.1
Oakville, ON · Road running · 21km / 10km / 5km
2026 Muskoka Marathon
Bracebridge, ON · Road running · 42km / 21km / 10km / 5km
The County Marathon 2026
Prince Edward, ON · Road running · 21km / 42km / 5km / 1km
Lighthouse to Lighthouse Half Marathon & 5K
Kincardine, ON · Road running · 5km / 21km
Thornbury Turkey Trot 2026
Thornbury, ON · Road running · 21km / 10km / 5km / 1km
The Maple Leaf March -- La Marche Maple Leaf
Ottawa, ON · Road running · 5km / 10km / 21km / 42km
Long Sault Trail Race & Ultra
Bowmanville, ON · Trail · 7km / 14km / 21km / 2km
9runrun - Ottawa
Ottawa, ON · Road running · 5km / 10km / 2km / 21km
2026 TCS Toronto Waterfront Marathon
Toronto, ON · Road running · 5km / 42km / 21km
2026 Women's Training Program
Toronto, ON · Road running · 42km / 21km
The Wawa Trifecta
Wawa, ON · Trail · 6km / 1km / 22km
Nottawasaga Fall ClassicDate TBA
Wasaga Beach, ON · Road running · 10km / 20km
Race Around the Place
Carleton Place, ON · Road running · 5km / 10km / 21km
U.S. & International Registrants, Niagara Falls 10k, Half & Marathon 2026
Niagara Falls, ON · Road running · 42km / 21km / 10km
Niagara Falls 10k, Half & Marathon 2026
Niagara Falls, ON · Road running · 42km / 21km / 10km
Niagara Falls 5k, 10k, Half & MarathonDate TBA
Niagara Falls, ON · Road running · 42km / 21km / 10km / 5km
U.S. & International Registrants, Niagara Falls 5k, 10k, Half & MarathonDate TBA
Niagara Falls, ON · Road running · 42km / 21km / 10km / 5km
2026 Hamilton Marathon Road2Hope
Hamilton, ON · Road running · 5km / 1km / 10km / 21km