Ultramarathons in Ontario
Ultramarathons across Ontario: 20 with a confirmed date (20 more are waiting on a date). Next up: Run Off-the-Grid on September 26, 2026.
Updated daily — every listing links to the organizer's official registration page.
When
40 races listed
- Saturday, September 26, 2026
Run Off-the-Grid
Mattawan, ON · Trail · 50km / 25km / 5km · from 122
- Saturday, October 3, 2026
UpRiver Running Fall Races
Thunder Bay, ON · Trail · 50km / 25km / 10km
- Sunday, October 4, 2026
Run The CavesPrice rises soon
Warsaw, ON · Trail · 5km / 1km / 10km / 15km · from 45
- Sunday, October 4, 2026
The Hustle at PinehurstReg closes soon
Ayr, ON · Trail · 12km / 25km / 50km · from 130
- Date to be announced
Run The CavesDate TBA
Peterborough, ON · Trail · 1km / 5km / 10km / 15km
- Saturday, October 10, 2026
Sticks n' Stones Trail Race 2026Reg closes soon
Hamilton, ON · Trail · 5km / 10km / 26km / 53km · from 73
- Sunday, October 11, 2026
The Maple Leaf March -- La Marche Maple Leaf
Ottawa, ON · Walk · 5km / 10km / 21km / 42km · from 40
- Saturday, October 17, 2026
Wise Raven Trail Race
Waterloo, ON · Trail · 5km / 10km / 25km / 50km · from 56
- Saturday, October 17, 2026
Phoenix Trail Races
London, ON · Trail · 25km / 50km · from 30
- Saturday, October 17, 2026
Creemore Vertical Challenge
Creemore, ON · Trail · 80km / 55km / 27.5km / 14km
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.
- Saturday, October 24, 2026
The Bad Thing 2026
Auburn, ON · Trail · 25km / 50km · from 140
- Saturday, November 7, 2026
The Beav Trail Race 2026
Milton, ON · Trail · 10km / 25km / 50km · from 89
- Sunday, November 15, 2026
Fat Ass Trail Run
Quinte West, ON · Trail · 50km / 24km / 16km / 10km · from 60
- Saturday, April 10, 2027
Caledon Crusher
Mono, ON · Trail · 50km / 25km
- Date to be announced
The Foxtail Rail Trail Race (Paul Turkstra Memorial)Date TBA
Dundas, ON · Road running · 5km / 10km / 25km / 50km
- Date to be announced
Pick Your Poison Trail RunDate TBA
Barrie, ON · Trail · 50km / 25km / 12km
- Date to be announced
The Rugged Raccoon Night RaceDate TBA
St. Marys, ON · Trail · 10km / 25km / 50km
- Date to be announced
Seaton Scramble Trail RaceDate TBA
Pickering, ON · Trail · 50km / 7km / 15km / 25km
- Date to be announced
Conquer The CanuckDate TBA
Cambridge, ON · Trail · 12km / 25km / 50km
- Saturday, May 29, 2027
Sulphur Springs
Ancaster, ON · Trail · 100km / 50mi / 50km / 20km
- Date to be announced
TTUAH - Trail Terrier Ultra Around HamiltonDate TBA
Carlisle, ON · Trail · 100mi
- Friday, June 11, 2027
The Ribbon 200
The Blue Mountains, ON · Trail · 200mi / 100mi / 72.5km
- Date to be announced
Rainbow Trail RunDate TBA
Simcoe County, ON · Trail · 12km / 24km / 50km / 62km
- Saturday, June 19, 2027
The Whole Enchilada
Uxbridge, ON · Trail · 50km / 25km / 8km / 4km · from 47
- 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
Summit 700 Trail RunsDate TBA
Grey County, ON · Trail · 5km / 50km / 10km / 21km
- Date to be announced
The First Blaze Trail RaceDate TBA
Milton, ON · Trail · 52km / 27km / 10km / 50km
- Date to be announced
E•60, from The ENDURrunDate TBA
Conestogo, ON · Road running · 60km
- Date to be announced
Tally in the Valley Trail RaceDate TBA
Hamilton, ON · Trail · 100mi / 7km / 21km
- Date to be announced
Falling Water Trail Marathon/ Half MarathonDate TBA
Eugenia, ON · Trail · 42km / 21km / 63km
- Sunday, August 15, 2027
The ENDURrun 2027
Conestogo, ON · Road running · 160km / 80km · from 443
- Date to be announced
Middle Path Trail RaceDate TBA
Peterborough County, ON · Trail · 2km / 8mi / 26km / 13km
- Date to be announced
The Devil's KeyDate TBA
Duntroon, ON · Trail · 16km / 33km / 66km
- Date to be announced
24 Hour To Empower Running ChallengeDate TBA
Barrie, ON · Road running · 5km / 10km / 15km / 20km
- Date to be announced
SOO 200Date TBA
Goulais River, ON · Trail · 200mi / 100mi / 50km / 100km
- Date to be announced
Haliburton Forest Trail RaceDate TBA
Haliburton, ON · Trail · 100mi / 50mi / 26km / 50km
- Friday, December 31, 2027
The Great Neighbourhood Challenge
Toronto, ON · Road running · 5km / 50km / 100km · from 49
- Date to be announced
Seawater Stride 2030 Hosted by LGDDate TBA
Mississauga, ON · Road running · 100km / 5km / 10km / 21km · from 29
Ultramarathons in Ontario — FAQ
- How many ultramarathons are there in Ontario in 2026?
- Ultramarathons listed for Ontario right now: 20 with a confirmed date, plus 20 that ran last season and haven't announced their next one. The list refreshes nightly as organizers announce new dates.
- What is the next ultramarathon in Ontario?
- Run Off-the-Grid in Mattawan on September 26, 2026.
- Which Ontario cities host the most ultramarathons?
- Mattawan (1), Thunder Bay (1), Warsaw (1).