Marathons in Ontario, Canada
Find marathons in Ontario, Canada. Compare 4 upcoming events by date and location. Open a race guide for the course, recorded editions and official entry information where available.
Events to explore include Niagara Falls International Marathon, Beneva Mississauga Marathon and Tamarack Homes Ottawa International Marathon.
5 listed events · 4 with upcoming dates
Upcoming marathons
4 matching events, earliest date first. Entry availability is shown separately.
Niagara Falls International Marathon
CANNiagara Falls, Ontario
Niagara Falls October international marathon.
· Marathon
Race details, entry and past editions →Entry information ↗Beneva Mississauga Marathon
CANMississauga, Ontario
Mississauga April point-to-point marathon.
· Marathon
Race details, entry and past editions →Entry information ↗Tamarack Homes Ottawa International Marathon
CANOttawa, Ontario
Ottawa Race Weekend marathon.
· Marathon
Race details, entry and past editions →Entry information ↗Tamarack Ottawa International Marathon
CANOttawa, Ontario
Ottawa Race Weekend May marathon.
· Marathon
Race details, entry and past editions →Entry information ↗Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
Georgina Marathon
CANGeorgina, Ontario
Georgina Marathon in Georgina.
Next date not listed
Race guide and recorded editions →Choosing a race in Ontario
The unfiltered upcoming calendar includes events in Ottawa (2), Mississauga (1), Niagara Falls (1). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about marathons in Ontario
Which marathons are coming up in Ontario, Canada?
Niagara Falls International Marathon is listed for 25 October 2026. Beneva Mississauga Marathon is listed for 25 April 2027. Tamarack Homes Ottawa International Marathon is listed for 30 May 2027. Check the race guide and organiser’s latest information before making plans.
Where can I find race entry details for Ontario, Canada?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.