How many marathons are there in Ontario in 2026?

Marathons listed for Ontario right now: 10 with a confirmed date, plus 11 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?

Nemo Memorial Run - Run for the Heroes. in Toronto on November 27, 2026.

Which Ontario cities host the most marathons?

Toronto (4), Mississauga (1), Georgina (1).

Marathons in Ontario

Marathons across Ontario: 10 with a confirmed date (11 more are waiting on a date). Next up: Nemo Memorial Run - Run for the Heroes. on November 27, 2026.

Updated daily — every listing links to the organizer's official registration page.

5K races 10K races Half marathons Ultramarathons Trail races Obstacle races (OCR)

When

Confirmed dates only

21 races listed

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
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

New races in Ontario, once a month

Newly listed races, and the registrations closing in the next three weeks. One email a month. Every subscriber is in the monthly $25 gift-card draw, held on the 1st. One click to leave.

Marathons in Ontario — FAQ

How many marathons are there in Ontario in 2026?: Marathons listed for Ontario right now: 10 with a confirmed date, plus 11 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?: Nemo Memorial Run - Run for the Heroes. in Toronto on November 27, 2026.
Which Ontario cities host the most marathons?: Toronto (4), Mississauga (1), Georgina (1).