The Complete List of Triathlons In Ontario 2025

Versatility isn’t always rewarded in sport. While there is genuine merit to honing one specific, often highly specialized skill set, there’s something innately human about wanting to do more. The triathlon is an event that pushes athletes to excel in multiple disciplines in the water and on land. The sense of accomplishment after pushing yourself and completing a race affords a sense of accomplishment unlike any other.

There is no one type of triathlon, just like there’s no one kind of triathlete. Whether you are a veteran or looking to try your first event, Triathlon Ontario, which supports the development of safe and fair multisport in Ontario, is your best resource. They will get you excited and provide a great community of enthusiasts for all the motivation you’ll need to prepare for your next race.

This list compiles all of the Triathlon events taking place in Ontario during 2025. Whether you’re seasoned and looking to shave time off last year’s race, or you’re brand new to triathlon, there’s a spectrum of events taking place this year across the province.

February

3 Winterlude Triathlon, Ottawa, ON

Nicknamed "the most Canadian event around," Winterlude Triathlon has been running since 1984 as part of Ottawa’s iconic annual winter festival. For a unique twist, the disciplines include skating, running and cross-country skiing.

May

17 - Early Bird Triathlon, Ottawa, ON

This family-friendly season warm-up is held at Carleton University and features a closed biking course and a cozy pool swim (widely considered to be preferable than a fresh dip in a lake in mid-May). Choose from a list of triathlon and duathlon events.

25 - C3 Royal Containers Benson Steel Kids of Steel & Adult Pool Triathlon, Caledon, ON

This event has been running for over 20 years and is a chance for the entire family (from ages three to 80) to compete.

June

1 - Subaru Milton Triathlon, Milton, ON

Based out of Kelso Conservation Area in Milton, this is the Subaru series’ first race of the season. A variety of races are available: Try-A-Tri, Sprint Triathlon, along with a Duathlon. The crux of the course is the “6th Line hill” and the highlight is the scenic running course, which follows both road and cross-country trails.

7 - 8 - MultiSport Canada Gravenhurst Triathlon, Gravenhurst, ON

Set in the heart of cottage country, this is a full weekend of racing, with something for everyone. Racers start their swim from the Muskoka Steamboats. The race weekend gives athletes an opportunity to race in the Sprint and Olympic distance triathlons, as well as Sprint and International Duathlons.

14 - 15 - Subaru Triathlon Series - Guelph Lake I , Guelph, ON

The Subaru Guelph Lake One Triathlon weekend is one of Ontario’s most popular and longest-running races. There are a wide variety of races and distances to choose from for athletes of all abilities and levels of experience, including Try-a-Tri, Sprint, and standard distance triathlons and duathlons.

21 - 22 - Rose City Triathlon, Welland, ON

The Welland International Flatwater Centre is one of the most exciting swim courses Ontario has to offer. The canal swim course is a 2,000-metre single-loop, clockwise swim with great viewing for spectators. Calm waters and a roaring crowd will greet racers as they exit the swim and run directly up the Grandstands into the transition area. The closed bike course is flat and fast. The long course runs on Saturday and the Sprint course on Sunday.

22 - The TriMuskokan Short Course Triathlon and Try-a-Tri, Huntsville, ON 

This homegrown grassroots race is an incredible community event that focuses on a great experience for everyone—first-timers and seasoned triathletes alike—in the bustling Muskoka town of Huntsville. It offers relay events, bike/run duathlons, and a swim/bike event.

28 - 29 - North Bay Triathlon Weekend, North Bay, ON

A true community event showing off North Bay’s hospitality. All three of the triathlon's events meet the highest standard and are sanctioned by Triathlon Ontario. The weekend starts off with 200 kids participating in a non-competitive event run through the Birchhaven neighbourhood. On day two there is the North Bay Try-a-Tri event for those who are less experienced triathletes and want to “Try a Triathlon.”

29 - Kids in Triathlon - Oakville, Oakville, ON

This triathlon is part of the Kids In Triathlon (KITCan) Series. A non-competitive race series for kids aged three to 11 years old. It's a family-friendly environment, motivating kids to get fit, have fun and gain confidence.

July

6 - Subaru Ironman 70.3 Muskoka, Huntsville, ON

This midsummer race is beloved for its stunning Central Ontario beauty and naturally tough course (as if Ironman courses weren’t tough enough).

12 - 13 - MultiSport Canada Bracebridge Triathlon and Duathlon, Bracebridge, ON

From beginners to experienced athletes, there’s something for everyone at this full weekend of events in the heart of cottage country. Events ranging from Sprint Triathlon/Duathlon and Give-it-a-Tri to Olympic Triathlon/Duathlon give everyone an opportunity to participate.

13 - Kids in Triathlon - Mississauga, Mississauga, ON

This triathlon is part of the Kids In Triathlon (KITCan) Series. A non-competitive race series for kids aged three to 11 years old. It's a family-friendly environment, motivating kids to get fit, have fun and gain confidence.

19 - Lakeshore Women's Triathlon, Saugeen Shores, ON

This community-based event is intended to give women a venue to enter the world of triathlons. For 20 years, it has raised money for local charities. This race was previously called the Kincardine Women's Triathlon.

19 - 20 - Bluewater Triathlon, Bright’s Grove, ON

There are eight events to choose from in Lambton County, with the feature event being an Olympic triathlon course, consisting of a 1.5-kilometre swim, a 40-kilometre bike, and a 10-kilometre run. The swim leg is in Lake Huron but is parallel to the shore, and the bike leg is a fast and flat out-and-back course. This race is for both solo racers and relay teams.

19 - 20 - XTERRA Conquer the Crater, Sudbury ON

This 100-percent charitable event is in support of the Northern Cancer Foundation’s Miles Against Cancer fund, but don’t think it’s not competitive in nature. There are 10 direct qualifying spots for the XTERRA World Championships in Hawaii. It’s open to everyone and offers events for kids. The races are based in Kivi Park.

20 - Copper Town Triathlon, Bruce Mines, ON

This will be the 2nd annual Copper Town Triathlon being held in Bruce Mines. The race features a beautiful course. The swim starts from the Bruce Mines Marina on the shores of Lake Huron. It will transition to the bike portion that will be a looped course down Copper Bay Road and finish with a scenic paved out and back run with a few hills on Taylor Street.

20 - MultiSport Canada K-Town Triathlon, Kingston, ON

One of the oldest races in the province, the K-Town race boasts a scenic course through Kingston and along Lake Ontario. Athletes can participate in the Long Course Triathlon or Triathlon/Duathlon. Relay entrants welcome.

20 - Subaru Triathlon Series, Owen Sound, ON

The Owen Sound installment of the Subaru Triathlon Series line-up features a Sprint and Olympic-distance triathlon, based on Georgian Bay in Kelso Beach Park.

27 - Toronto Triathlon Festival, Toronto, ON

The welcoming TFF serves athletes of all capabilities, offering both Sprint and Olympic distance races (and relay options). The courses will take you on memorable journeys through Toronto’s unique landscape, as concrete jungles give way to picturesque hills and valleys. Designed to welcome Olympians, weekend warriors, and those looking to add a challenging event to their bucket list.

TBD - Pure Kids Triathlon Series – Adventure Bay, Windsor, ON

The Pure Kids Triathlon Series – Adventure Bay is held in the greater Windsor-Essex region.  The event gets kids ages 3 to 13 actively engaged in sport. Proceeds go to support KidSport to get more kids involved in activities year-round. This series also hosts yearly events in: London, Leamington, Burlington, Niagara and Milton.

August

3 - Kids in Triathlon - Milton, Milton, ON

This triathlon is part of the Kids In Triathlon (KITCan) Series. A non-competitive race series for kids aged three to 11 years old. It's a family-friendly environment, motivating kids to get fit, have fun and gain confidence.

3 - Ironman Canada – Ottawa, Ottawa, ON

Visit Canada’s capital city to participate in this 2025 Ironman Canada event. This summer race will feature gorgeous landscapes, hearty post-race meals and warm hospitality. The Ironman race series consists of a 3.8 km swim, 180 km bike and 42.2 km run. To learn more about qualifying, registration or volunteering, visit the Ironman website.

9 - Niagara Triathlon, Grimsby, ON

The Niagara Triathlon is held at a very compact site that creates a fun, family-friendly atmosphere. Participants can race in the morning and check out Wine Country in the afternoon. There are six events offered, which involve swim legs in Lake Ontario and flat bike courses.

9 - 10 - Barrie Triathlon, Duathlon and Kids of Steel, Barrie, ON

This community Triathlon and Duathlon mission is to promote a healthy and active lifestyle for locals in Barrie and environs. The welcoming venue is perfect for families and fans, as they can cheer on competitors up to eight times along the route. The bike course is closed to vehicles; the swim begins with a beach start organized into heats determined by age. The running course is on a paved walking path. This year’s races include: the full Triathlon,  sprint races for Triathlon and Duathlon events and a series of Kids of Steel events.

10 - Thousand Islands Triathlon & Duathlon, Brockville, ON

The Thousand Islands Triathlon & Duathlon features the historic Brockville Railway Tunnel as part of its run course. Nestled in beautiful Brockville, and based at the Brockville Rowing Club, this race is popular and fun for participants and spectators alike.

17 - Petawawa Triathlon, Black Bay, Petawawa; ON

Sponsored by J’s Adventures, this race offers a range of options for multisport enthusiasts looking to participate in a 2025 event in the Ottawa Valley. Featuring a: Sprint Triathlon (750 m swim, 20 km bike, 5 km run), Sprint Team Relay (750 m swim, 20 km bike, 5 km run by a team of 2 or 3) and a Super Sprint (350 m swim, 10 km bike, 2.5 km run) this will be an unforgettable race day with swims on the open waters of beautiful Black Bay.

16 - 17 - MultiSport Canada Toronto Island Triathlon, Toronto, ON

Grab your gear and hop on the ferry to the Multisport Toronto Island Tri! Not surprisingly, the swim is in Lake Ontario, and the island bike route is flat and free of traffic. Events include Sprint Triathlon, Duathlon, Aquathlon, Aquabike, Give-It-A-Tri Triathlon, and relays.

24 - Subaru Women’s Triathlon Festival, Grimsby, ON

The Subaru Women’s Triathlon Festival and the Canadian Cancer Society (CCS) have teamed up to change the future of breast cancer. Subaru Triathlon Festival for Women 2025 is more than a fundraiser. It’s a chance for participants to come together and celebrate the survivors in their communities, who send a powerful message of hope for those living with the disease. It’s a place to honour and remember those we’ve lost to cancer. In the past 9 years, athletes have helped raise over $150,000 for the CCS breast cancer cause through the Subaru Women’s Triathlon Festival.

23 - MultiSport Canada Wasaga Beach Triathlon, Wasaga Beach, ON 

This full day of events is based at the famous Wasaga Beach. After a swim in Georgian Bay, racers will have a flat and fast bike leg with a few small hills and a fast running course along the waterfront. Events: Sprint Triathlon, Duathlon, Olympic Triathlon, Aquabike, Aquathlon, and Relays.

23 - 24 - Cornwall Triathlon, Cornwall, ON

The Cornwall Triathlon offers a unique experience that sets it apart from other triathlons in the region. It features traffic-free courses in the city core on both event days. Saturday events include a Duathlon of varying distances for ages 14 and under, and a Triathlon of varying distances with a pool swim for ages seven to 14. The Sunday events include a five-kilometre run, Try-A-Tri, Sprint and Olympic Triathlon distances, and a Sprint Duathlon. The swim is in the St. Lawrence River, and the run is on a riverside recreational path.

30 - The Canadian Triathlon & Duathlon, Ottawa, ON

The Canadian is the final and most exciting triathlon and duathlon event on the Somersault summer schedule. It features a dramatic finish on the Terry Fox Athletic Facility running track in front of a crowd of cheering spectators. In all, there are nine events, including the only half-Ironman event in Eastern Ontario.

30 - Triathlon Ontario Provincial Championships, Welland, ON

This event bills itself as the closest experience to ITU (International Triathlon Union) racing in Ontario. All participants must be Triathlon Ontario members (or members of their home PGB if not an Ontario resident). All participants, with the exception of those registered in the Age Group division, must be “draft legal” certified by Triathlon Ontario. There is a team component to the Age Group draft legal race. A team will be made up of four people (of the same gender). This creates a race within a race, and team members are encouraged to work together and employ different strategies to play to each other’s strengths. For the full 2025 Canadian National Development Series calendar, click here.

30- Subaru Triathlon Series - Guelph Lake II, Guelph, ON

The second visit to Guelph Lake Conservation Area is the perfect way to cap off a season on the Labour Day long weekend. The sprint distance features a 750 m swim, a 30 km bike, and a 7 km run that never leaves the park. Try-A-Tri, Duathlon, Relay, and Swim/Bike options are available as well.

31 - Kids In Triathlon – Milton, Milton, ON

This triathlon is part of the Kids In Triathlon (KITCan) Series. A non-competitive race series for kids aged three to 11 years old. It's a family-friendly environment, motivating kids to get fit, have fun and gain confidence.

September

6 - Camp Tri, Long Sault, ON

Start at Milles Roche Island and swim shallow waters, bike a smooth parkway and run packed asphalt and gravel trails.

6 - 7 - MultiSport Canada Lakeside Triathlon, Duathlon and Kids of Steel, London, ON

The Lakeside Triathlon and Duathlon series covers it all on this early fall weekend. The whole family can race in events that include Sprint Triathlon, Duathlon, Aquabike, Aquathlon, Olympic Triathlon, Give-It-A-Tri Triathlon, and Relays. Youth races are offered for ages three to 15.

7 - Xterra Sleeping Giant, Thunder Bay, ON

The swim will be in the clean, clear, spring-fed Marie Louise Lake, in Sleeping Giant Provincial Park. From there you experience the contrast between the beauty and the beast in stunning northwestern Ontario. Beauty belongs to the undulating, predominantly singletrack mountain bike trail. Intended to be a fast ride, it will provide ample opportunity for passing. Beastly better describes the more technical yet beautiful trail run. Racers will run underneath forest canopies and over creeks, all the while enjoying views of Lake Superior.

14 - Barrelman Niagara Falls, Welland ON

The only point-to-point race in the province, this race starts at the Welland International Flatwater Centre and winds its way through the beautiful Niagara countryside, ending at the world-famous Niagara Falls. The Welland International Flatwater Centre has become an ideal location for warm, pristine open-water swimming. Swim/Bike, Bike/Run, and Relays are all optional events.

This is your year to participate in a multisport race!

There’s no time like now to take to the pool, the track, the trails, the road, or the gym to start training for a 2025 Triathlon or Duathlon event. Winning isn’t the objective; these races are all about personal achievement, community and athleticism. Register for an event as soon as possible — and have a blast out there. 

Celebrate Your Race at an Ontario triathlon

So go ahead, pick a race that suits you. Then get training, because that’s the only way to bring the finish line into focus. Invite your friends and family to cheer you along at one of these triathlon events in Ontario.

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