Michigan
Michigan Triathlon Calendar 2025-2026
Monthly updates for Michigan
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in Michigan for 2025-2026! Our updated list features 27 exciting races across the region. Find your next race in Michigan below and join the running community at these great events!
August 2026
Race the Straits of Mackinac in Mackinaw City offers sprint to long course multisport races for all levels. Swim under the Mackinac Bridge, ride toward Wilderness State Park and finish in Fort Mackinac Park.
Join the Barron Lake Triathlon in Niles, Michigan on August 22, 2026 for a scenic sprint swim, bike, and run that starts from the sandy shore of Barron Lake. Family friendly races include team relays plus kids competitive and non competitive events.
September 2026
Race the MI Triathlon and Duathlon Championship at Belle Isle in early September 2026, with triathlon, duathlon, aquabike and relay options on a scenic island course. Distances from sprint to Olympic welcome racers of all levels.
Dive into the third annual Dragon Trails Sprint Triathlon in scenic Lake Orion, Michigan. Tackle a 0.75K swim, 20K mixed terrain bike and 5K trail run with relay option and a capped field of 100 athletes.
Race IRONMAN 70.3 Michigan in Frankfort on September 20 2026. PLAYTRI will be onsite offering bike rentals, repairs and race ready tune ups so you can focus on the course. Reserve services early online.
Join The Last TRI on Sunday September 20 2026 at Stony Creek Metropark in Shelby Township Michigan for swim, bike and run courses around a scenic lake with a closed bike course. Options include relays, aquabike, and multiple distances for all abiliti..
October 2026
Join the Grand River Color Tour Triathlon on October 3, 2026 in Eaton Rapids MI for kayaking, cycling, and a 5K finish showered in colorful powder. Choose the full triathlon, a 5K only, kayak rental, or a three person relay.