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Races in May 2027 in Ontario

13 races with a confirmed date in May 2027 across Ontario — the biggest group is 10K races (10). The busiest day is Saturday, May 8, 2027 with 2 races. Every listing links to the organizer's official registration page.

June →May across Canada

The big ones in May

Multi-distance race weekends — the ones worth planning around.

What May is made of

10K races · 105K races · 8Half marathons · 3Marathons · 2Ultramarathons · 1

Where they are

Ottawa · 3Ancaster · 1Brighton · 1Kitchener · 1Markham · 1Oakville · 1

Every race in May

When

13 races listed

Other months

September 2026October 2026November 2026December 2026January 2027February 2027

Races in May 2027 — FAQ

How many races are there in May 2027 in Ontario?
13 with a confirmed date, and the biggest group is 10K races with 10. The busiest single day is Saturday, May 8, 2027, with 2 races. Recompiled nightly from the organizers' own calendars, so the number moves as races are announced.
When should I register for a May race?
Most Canadian races take entries until race week — what expires first is the price tier, not the spot. Check the fee window on the race's page before you wait.
Do I sign up here?
No. Every listing links straight to the organizer's own registration page. RaceFinder never takes signups or a cut.

Planning further out? Build a season, see when race season peaks in Canada, or check which entry fees go up next.