100 Mile Races in Ontario

Browse 2 upcoming 100 mile races in Ontario, with dates, locations, and event details for each listing. Also explore 5K, Road, 10K, 1K, and Trail races in Ontario, or compare options to find your next 100 mile start line.

upcoming races: 2
next race · 2027: May 29
distances: 5

Ontario race calendar

May 2027

MAY29Sat, May 29
100 MI
Sulphur Springs Trail RaceAncaster, ONTrail · 100K / 100 Mile +4Trail · 100K / 100 Mile +4

More race types in Ontario

Distances and race types