Ontario
Triathlon Calendar Ontario 2026-2027
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 19 exciting races across the region. Find your next race in Ontario below and join the running community at these great events!
August 2026
Youth triathlon and duathlon in Cornwall with indoor pool swims, a traffic free bike course and age-group distances for 4 to 14 year olds.
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.
Monthly updates for Ontario
Get new running races (and updates) in your inbox every month.
September 2026
Multisport races and runs at Mooney's Bay with closed-road cycling on Colonel By Drive and finish inside the Terry Fox Athletic Facility.
Multi-discipline triathlon at Guelph Lake Conservation Area on September 5, 2026 offering sprint triathlon, duathlon, swim bike, relays and a Try A Tri.
The 2026 draft legal Provincial Championships in Welland feature Super Sprint, draft legal races across Elite U23, Junior, Youth 14 15 and Age Group categories.
A multi-format swim bike and run event on September 12 at Woodlands Beach featuring Olympic and Sprint distances, scenic island-hopping bike routes, and on-site camping options.
A multi-race weekend at Lakeside Resort on Lake Sunova offering swim, bike and run courses for adults and children.
Cataraqui Adventure Trek lists solo and two person team entries with MT Adventures and online registration closes Sep 11.
Teams of two navigate paddling, trekking and mountain biking on the Canadian Shield to score points across 28 checkpoints in a six hour event.
Barrelman Niagara Falls offers half and Olympic triathlon formats with swim, bike and run courses on September 20, 2026, plus course maps and event services.
January 2027
A winter triathlon in Ottawa combining skating on the Rideau Canal, a 5 km run and a 6 km cross-country ski leg as part of the Winterlude Festival.
May 2027
Early Bird Triathlon & Duathlon in Ottawa pairs indoor pool swims with closed road cycling and running along Colonel By Drive, offering multiple distances and race day services.
July 2027
A multi-discipline race at CFB Kingston with Sprint, Olympic, Enduro and duathlon options, calm swim conditions, a scenic bike toward Gananoque, and a run past Barriefield Rock Garden.
A mid-summer IRONMAN 70.3 in Huntsville, Ontario featuring a swim in Peninsula Lake, a rolling and challenging bike course, and a run on wooded trails.
Triathlon at Exhibition Place in Toronto on July 25, 2027 offering Olympic and Sprint formats with individual, relay and corporate challenge entry options.
August 2027
Swim along the St. Lawrence waterfront and run through Brockville’s 500 m railway tunnel with music and lights, plus races from 5K to Olympic triathlon.