Races in August 2027 in Ontario
12 races with a confirmed date in August 2027 across Ontario — the biggest group is 5K races (1). The busiest day is Saturday, August 28, 2027 with 3 races. Every listing links to the organizer's official registration page.
The big ones in August
Multi-distance race weekends — the ones worth planning around.
- Saturday, August 7, 2027
Barrie - Sat Aug 7 and Sun Aug 8
Barrie, ON · Tri · 25km · from $44
- Saturday, August 7, 2027
The 5K Foam Fest - Ottawa
Ottawa, ON · OCR · 5km · from $58
- Sunday, August 8, 2027
IRONMAN Canada-Ottawa
Ottawa, ON · Tri · 180km / 42.2km / 3.8km
- Saturday, August 14, 2027
Toronto Island - Sat Aug 14 and Sun Aug 15
Toronto, ON · Tri · 25km · from $81
- Sunday, August 15, 2027
Mudskipper SwimRun - Milton and the Milton Open Water Swim and Trail Run
Milton, ON · Tri · 20km / 15km / 10km / 7km · from $9
- Sunday, August 15, 2027
The ENDURrun 2027
Conestogo, ON · Road · 160km / 80km · from $443
- Saturday, August 21, 2027
Spartan Ottawa Event Weekend
Calabogie, ON · OCR · 10km / 5km
- Saturday, August 28, 2027
Wasaga Beach - Sat Aug 28
Wasaga Beach, ON · Tri · 51km / 25km · from $118
What August is made of
Where they are
Every race in August
When
12 races listed
- Saturday, August 7, 2027
Barrie - Sat Aug 7 and Sun Aug 8
Barrie, ON · Triathlon / duathlon · 25km · from 44
- Saturday, August 7, 2027
The 5K Foam Fest - Ottawa
Ottawa, ON · Obstacle (OCR) · 5km · from 58
- Sunday, August 8, 2027
IRONMAN Canada-Ottawa
Ottawa, ON · Triathlon / duathlon · 3.8km / 180km / 42.2km
- Saturday, August 14, 2027
Toronto Island - Sat Aug 14 and Sun Aug 15
Toronto, ON · Triathlon / duathlon · 25km · from 81
- Sunday, August 15, 2027
The ENDURrun 2027
Conestogo, ON · Road running · 160km / 80km · from 443
- Sunday, August 15, 2027
Mudskipper SwimRun - Milton and the Milton Open Water Swim and Trail Run
Milton, ON · Triathlon / duathlon · 10km / 20km / 1500m / 3km · from 9
- Friday, August 20, 2027
The Last Hour - Part of the Happy Hour Series
Thomasburg, ON · Trail · 8km
- Saturday, August 21, 2027
Spartan Ottawa Event Weekend
Calabogie, ON · Obstacle (OCR) · 5km / 10km
- Sunday, August 22, 2027
5K Nude Colour Fun Run - 2027
East Gwillimbury, ON · Road running · 5km · from 5
- Saturday, August 28, 2027
Wasaga Beach - Sat Aug 28
Wasaga Beach, ON · Triathlon / duathlon · 51km / 25km · from 118
- Saturday, August 28, 2027
The 5K Foam Fest - Toronto, ON
Uxbridge, ON · Obstacle (OCR) · 5km · from 58
- Saturday, August 28, 2027
Zulu Challenge Windsor
Windsor, ON · Obstacle (OCR)
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.
Races in August 2027 — FAQ
- How many races are there in August 2027 in Ontario?
- 12 with a confirmed date, and the biggest group is 5K races with 1. The busiest single day is Saturday, August 28, 2027, with 3 races. Recompiled nightly from the organizers' own calendars, so the number moves as races are announced.
- When should I register for a August 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.