The Dirty Mitten Gravel Triathlon

The Dirty Mitten Gravel Triathlon

The event takes place on September 20, 2026, based at Camp Manitou-lin in Middleville, Michigan. It offers multiple multisport formats at two primary distance profiles described as sprint and Olympic. In-person formats include triathlon, duathlon, aquabike, and team relays. A virtual option runs during the month of September and is an untimed, on-your-own effort.

Event formats and discipline distances include:

• The Shorty Triathlon: Swim 750 m, Bike 14 miles, Run 5k
• The Shorty Duathlon: Run 5k, Bike 14 miles, Run 5k
• The Shorty Aquabike: Swim 750 m, Bike 14 miles
• The Shorty Relay 2 person: Swim 750 m, Bike 14 miles, Run 5k
• The Shorty Relay 3 person: Swim 750 m, Bike 14 miles, Run 5k
• The Long One Triathlon: Swim 1500 m, Bike 31.9 miles, Run 10k
• The Long One Duathlon: Run 5k, Bike 31.9 miles, Run 10k
• The Long One Aquabike: Swim 1500 m, Bike 31.9 miles
• The Long One Relays: Swim 1500 m, Bike 31.9 miles, Run 10k
• The Dirty Mitten Virtual: untimed, choose distance and venue in September

Most in-person registration opens December 3, 2025 and closes December 9, 2025. Virtual registration remains open through September 19, 2026. Average air temperatures are listed as 54 F to 70 F. Average water temperature is 67 F and wetsuit legal. Visit the organization's website for the most recent information.

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