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Triathlon Calendar Ontario 2026-2027

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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 2026-2027! Our updated list features 33 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!

February 2026
Feb
22
Su

Superior Triathlon

Triathlon
May 2026
May
16
Sa

Early Bird Triathlon & Run

Triathlon
June 2026
Jun
7
Su

Milton Triathlon

Triathlon
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
8
Sa

Subaru Women's Triathlon Festival

Triathlon
Aug
8
Sa

Run for Barrie

Triathlon
Aug
8-9
Sa - Su

Run for Barrie

Triathlon