Ontario
Triathlon Calendar Ontario 2026-2027
Monthly updates for Ontario
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Explore the best triathlons in Ontario for 2026-2027! Our updated list features 28 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!
August 2026
IRONMAN in Ottawa: a river swim, a rolling closed-road bike course through city and rural sections, and a downtown run finishing at Major's Hill Park.
Open water swims, an individual and relay swimrun, and 5K and 10K trail runs along the Welland Recreational Canal on August 2, 2026.
A women’s Sprint and Try A Tri on August 8, 2026 at Nelles Beach Park in Grimsby featuring lake swims, flat bike and run courses, age group waves and charity fundraising.
Multisport weekend at Centennial Beach Park in Barrie featuring triathlons, duathlons and Kids of Steel with closed bike courses and official timing.
Multi-sport weekend at Barrie's Centennial Beach Park featuring swims in Kempenfelt Bay, fully closed bike courses and Kids of Steel youth races.
Triathlon and running events in Brockville on August 9 2026 featuring a 500 m historic railway tunnel, multiple distances, and professional timing.
Community triathlon at Ennismore Waterfront Park offering Try a Tri, Sprint Tri, Duathlon and relays with chip timing, medals, and a post race discount for bib holders.
Multisport event at Moonlight Beach on August 9, 2026 featuring a 1 km swim, 24 km cycle, 4 km canoe and 7.5 km run plus team and kids events.
Toronto Island weekend triathlon on the Toronto Islands with Give It A Tri, sprint, triathlon and duathlon formats and a swim from Centre Island Beach.
Swimrun, open water swims and trail runs at Area 8 Conservation Area in Milton on August 16, 2026, featuring 10K and 20K swimrun championship distances.
The third annual Mudskipper Canadian Individual SwimRun Championships take place at Area 8 Conservation area in Milton ON on August 16, 2026. The event pairs swims in Area 8 quarry with runs at Kelso Park and includes open water distances of 1.5K, 3K..
Sprint and Olympic triathlon and duathlon at Kelso Beach Park on August 16, 2026 offering Olympic standard qualifying spots for Worlds 2027.
A community triathlon in Petawawa offering sprint and super sprint formats, open water swims, transition area, and a post race meal and awards.
Cornwall Triathlon on August 23 2026 features Olympic and Sprint triathlons, a Try a Tri, a Sprint Duathlon and a 5 km run on traffic free city courses.
Provincial aquathlon at Kelso Lake with formats set by water temperature and a spot per age group for the 2027 world championships.
Triathlon and duathlon at Wasaga Beach on August 29 with a Georgian Bay swim, flat shared-road bike courses, and sprint and Olympic distances.
Team based adventure race at Kivi Park in Sudbury on August 29, 2026, featuring mountain biking, trekking and paddling over 30 to 45 km.
Open water swim and swimrun event at the Welland International Flatwater Centre on August 30 2026, featuring the return of the Welland 15K Ultraswim alongside other swim and swimrun distances.
September 2026
Triathlon, duathlon and road runs at Mooney's Bay on September 5, 2026 with canal side courses on Colonel By Drive and a finish at the Terry Fox Facility.
Triathlon and duathlon races at Guelph Lake on Sept 5, 2026 with sprint distances, relay options and a Try A Tri.