Triathlons & duathlons in Ontario

Triathlons & duathlons across Ontario: 5 with a confirmed date (33 more are waiting on a date). Next up: Cornwall Multisport Club Fall Duathlon on October 3, 2026.

Updated daily — every listing links to the organizer's official registration page.

5K races 10K races Half marathons Marathons Ultramarathons Trail races

When

Confirmed dates only

38 races listed

Saturday, October 3, 2026
Cornwall Multisport Club Fall Duathlon
Long Sault Parkway Ingleside Entrance, ON · Triathlon / duathlon
Date to be announced
Superior Triathlon #1Date TBA
Thunder Bay, ON · Triathlon / duathlon · 8km
Date to be announced
Superior Indoor Triathlon #2Date TBA
Thunder Bay, ON · Triathlon / duathlon · 8km
Date to be announced
TRi KiDS Triathlon Series LONDON, ONDate TBA
London, ON · Triathlon / duathlon
Date to be announced
TRi KiDS Triathlon Series BURLINGTON, ONDate TBA
Burlington, ON · Triathlon / duathlon
Date to be announced
Subaru Triathlon Series - MiltonDate TBA
Milton, ON · Triathlon / duathlon
Date to be announced
Oak Ridges Moraine Adventure RelayDate TBA
Gores Landing, ON · Triathlon / duathlon · 160km / 80km
Date to be announced
Gravenhurst TriathlonDate TBA
Gravenhurst, ON · Triathlon / duathlon · 51km / 25km
Date to be announced
Subaru Triathlon Series - Guelph Lake 1Date TBA
Guelph, ON · Triathlon / duathlon · 51km / 41km
Date to be announced
Lil’ Bones TriathlonDate TBA
Brantford, ON · Triathlon / duathlon · 1km / 2km / 100m

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.

Triathlons & duathlons in Ontario — FAQ

How many triathlons & duathlons are there in Ontario in 2026?: Triathlons & duathlons listed for Ontario right now: 5 with a confirmed date, plus 33 that ran last season and haven't announced their next one. The list refreshes nightly as organizers announce new dates.
What is the next one in Ontario?: Cornwall Multisport Club Fall Duathlon in Long Sault Parkway Ingleside Entrance on October 3, 2026.
Which Ontario cities host the most triathlons & duathlons?: Long Sault Parkway Ingleside Entrance (1), Kingston (1), Huntsville (1).