Marathons in Ontario
Marathons across Ontario: 14 with a confirmed date (10 more are waiting on a date). Toronto, Ottawa and Niagara Falls have the most. Next up: The County Marathon 2026 on October 4, 2026.
Updated daily — every listing links to the organizer's official registration page.
When
24 races listed
- Sunday, October 4, 2026
The County Marathon 2026Reg closes soonPrice rises soon
Prince Edward, ON · Road running · 21km / 42km / 5km / 1km · from 72
- Sunday, October 11, 2026
The Maple Leaf March -- La Marche Maple Leaf
Ottawa, ON · Walk · 5km / 10km / 21km / 42km · from 40
- Sunday, October 18, 2026
2026 TCS Toronto Waterfront Marathon
Toronto, ON · Road running · 5km / 42km / 21km / 1km
- Sunday, October 25, 2026
Niagara Falls 10k, Half & Marathon 2026Reg closes soon
Niagara Falls, ON · Road running · 42km / 21km / 10km · from 107
- Sunday, October 25, 2026
Niagara Falls International Marathon
Niagara Falls, ON · Road running · 10km / 5km
- Date to be announced
Niagara Falls 5k, 10k, Half & MarathonDate TBA
Niagara Falls, ON · Road running · 42km / 21km / 10km / 5km
- Sunday, November 1, 2026
2026 Hamilton Marathon Road2Hope
Hamilton, ON · Road running · 5km / 1km / 10km / 21km · from 66
- Friday, November 27, 2026
Nemo Memorial Run - Run for the Heroes.
Toronto, ON · Road running · 5km / 10km / 21km / 42km · from 29
- Thursday, December 31, 2026
Run to End Homelessness
Toronto, ON · Road running · 1mi / 5km / 10km / 21km · from 29
- Thursday, December 31, 2026
Run to End Child Hunger
Toronto, ON · Road running · 1mi / 5km / 10km / 21km · from 40
New races in Ontario, once a month
Newly listed races, and the registrations closing in the next three weeks. One email a month, one click to leave.
- Sunday, April 25, 2027
2027 Beneva Mississauga Marathon
Mississauga, ON · Road running · 42km / 21km / 10km / 5km
- Date to be announced
St Lawrence MarathonDate TBA
Cornwall, ON · Road running · 42km / 21km / 10km / 5km
- Sunday, May 2, 2027
Georgina Spring Fling 2027BQ
Georgina, ON · Road running · 42km / 21km / 10km / 5km · from 76
- Date to be announced
Toronto MarathonDate TBA
Toronto, ON · Road running · 42km / 21km / 10km / 5km
- Date to be announced
SudburyROCKSDate TBA
Sudbury, ON · Road running · 42km / 21km / 10km / 5km
- Saturday, May 29, 2027
Tamarack Ottawa Race Weekend
Ottawa, ON · Road running · 42.2km / 21.1km / 10km / 5km
- Date to be announced
Marathon for mental health and addictionDate TBA
Mount Forest, ON · Road running · 42km
- Sunday, June 20, 2027
Community Strong Race Weekend
Sault Ste. Marie, ON · Road running · 60km / 1km / 5km / 10km · from 24
- Date to be announced
Niagara UltraDate TBA
Niagara-on-the-Lake, ON · Road running · 80km / 50km / 42km / 21km
- Saturday, July 3, 2027
The Limberlost Challenge
Huntsville, ON · Trail · 56km / 42km / 28km / 14km
- Date to be announced
Falling Water Trail Marathon/ Half MarathonDate TBA
Eugenia, ON · Trail · 42km / 21km / 63km
- Date to be announced
Georgina Marathon & Half-MarathonDate TBA
Jacksons Point, ON · Road running · 42km / 10km / 21km / 5km
- Date to be announced
Monster of Mazinaw Trail RaceDate TBA
Cloyne, ON · Trail · 10km / 30km / 43km
- Date to be announced
Seawater Stride 2030 Hosted by LGDDate TBA
Mississauga, ON · Road running · 100km / 5km / 10km / 21km · from 29
Marathons in Ontario — FAQ
- How many marathons are there in Ontario in 2026?
- Marathons listed for Ontario right now: 14 with a confirmed date, plus 10 that ran last season and haven't announced their next one. The list refreshes nightly as organizers announce new dates.
- What is the next marathon in Ontario?
- The County Marathon 2026 in Prince Edward on October 4, 2026.
- Which Ontario cities host the most marathons?
- Toronto (4), Ottawa (2), Niagara Falls (2).