Marathons in Ontario
Ontario is home to 3 marathons in our database in Canada, spread across cities including Hamilton, Ottawa, and Toronto.
Toronto Waterfront Marathon is the largest race in the lineup, typically drawing around 14,000 finishers, while the full spread offers everything from fast urban courses to scenic regional events.
Browse the races below for course maps, elevation profiles, typical weather, and practical race-day detail to help you choose your next start line.
Close to this race
Nearby Marathons
Other races closest to Ontario.
BuffaloNew YorkUnited States· 145 km away
Buffalo Marathon
The Buffalo Marathon draws approximately 1,209 finishers each May on an urban road in Buffalo, United States. Western New York's signature Memorial Day marathon combines a flat course with strong local crowd support. The route passes Delaware Park, waterfront stretches along Lake Erie, and Buffalo neighborhoods on a flat urban loop. The course is very flat throughout.
Next race: Sunday, 30 May 2027
EriePennsylvaniaUnited States· 264 km away
Erie Marathon
The Erie Marathon draws approximately 1,300 finishers each September on a lakeside loop road in Erie, United States. Running almost entirely inside a state park gives it an unusually calm race-day feel for a fast marathon. The loop passes Lake Erie shoreline, wooded park roads, and wide open lake views with almost no climbing. The course is very flat throughout.
Next race: Sunday, 5 September 2027
ScrantonPennsylvaniaUnited States· 371 km away
Steamtown Marathon
The Steamtown Marathon draws approximately 1,500 finishers each October on a net-downhill point-to-point from Forest City to downtown Scranton, Pennsylvania. The course descends through the Pocono foothills and Lackawanna Valley on scenic country roads with autumn foliage. October's peak Pennsylvania colour and the fast descent make it a popular Boston-qualifier in the Anthracite Coal Region.
Next race: Sunday, 11 October 2026
ClevelandOhioUnited States· 401 km away
Cleveland Marathon
The Cleveland Marathon draws approximately 4,500 finishers on an urban road in Cleveland, United States. The course starts and finishes in downtown Cleveland. The route crosses the Hope Memorial Bridge, passes Rock and Roll Hall of Fame, and follows the Lake Erie shoreline. Hilly with climbs on the Hope Memorial Bridge and through Ohio City.
Next race: Saturday, 15 May 2027
South HeroVermontUnited States· 403 km away
Champlain Islands Marathon
The Champlain Islands Marathon draws approximately 136 finishers each October on a scenic coastal road in South Hero, United States. Vermont's Champlain Islands Marathon tours Lake Champlain archipelago roads each October. The course loops through Lake Champlain island roads with Adirondack and Green Mountain views. Rolling terrain with moderate climbs shapes the middle miles.
Next race: Sunday, 18 October 2026
