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Triathlon Calendar Ontario 2025-2026

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Monthly updates for Ontario

Get new running races (and updates) in your inbox every month.

Explore the best triathlons in Ontario for 2025-2026! Our updated list features 27 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!

February 2026
Feb
1
Su

Winterlude Triathlon

Triathlon
May 2026
May
16
Sa

Early Bird Triathlon & Run

Triathlon
June 2026
Jun
13
Sa

Oak Ridges Moraine Adventure Relay

Multisport
Jun
13-14
Sa - Su

Gravenhurst

Triathlon
Jun
14
Su

Welland Open Water SwimRun Challenge

Aquathlon
Jun
20
Sa

Guelph Lake Triathlon

Triathlon
Jun
27-28
Sa - Su

Rose City

Triathlon
July 2026
Jul
5
Su

IRONMAN 70.3 Muskoka

Triathlon
Jul
5
Su

Stonetown Triathlon

Triathlon
Jul
11
Sa

Bracebridge

Triathlon
Jul
18-19
Sa - Su

Bluewater Triathlon

Triathlon
Jul
18
Sa

Lakeshore Women's Triathlon

Triathlon
Jul
18
Sa

Niagara Triathlon

Triathlon
Jul
19
Su

K-Town

Triathlon
Jul
19
Su

Parry Sound Open Water SwimRun Challenge

Aquathlon
August 2026
Aug
2
Su

IRONMAN Canada-Ottawa

Triathlon
Aug
9
Su

Thousand Islands Triathlon & Runs

Triathlon 3 km 5 km 10 km
Aug
15-16
Sa - Su

Toronto Island Race

Triathlon
Aug
16
Su

Mudskipper Canadian SwimRun Championships

Aquathlon
Aug
16
Su

Mudskipper Canadian Individual SwimRun Championships

Aquathlon