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Races in October 2026 in Ontario

31 races with a confirmed date in October 2026 across Ontario — the biggest group is 5K races (13). The busiest day is Sunday, October 25, 2026 with 13 races. Every listing links to the organizer's official registration page.

November →Halloween Races & Costume RunsOctober across Canada

The big ones in October

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

What October is made of

5K races · 1310K races · 9Half marathons · 3Marathons · 2Ultramarathons · 1

Where they are

Brockville · 4Toronto · 3London · 2Milton · 2Niagara Falls · 2Ottawa · 2Auburn · 1Barrie · 1Brampton · 1Caledon · 1Cornwall · 1Dundas · 1

Every race in October

When

31 races listed

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.

Other months

November 2026December 2026January 2027February 2027March 2027

Races in October 2026 — FAQ

How many races are there in October 2026 in Ontario?
31 with a confirmed date, and the biggest group is 5K races with 13. The busiest single day is Sunday, October 25, 2026, with 13 races. Recompiled nightly from the organizers' own calendars, so the number moves as races are announced.
When should I register for a October 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.