Ann Arbor Tri, Du, & Aquabike – Gregory, MI 2026

Since 1986, the iconic and classic Ann Arbor Tri has been held in the Pinckney Recreation Area at Halfmoon Lake, one of the largest state parks in all of Michigan. You’ll swim the open waters of Halfmoon, bike the rolling paved country roads of the surrounding rural area, and then run the Potowatomi Trail. It’s a classic course you’ll come back to again and again. Choose Your Challenge! Olympic Triathlon — 1500 meter swim (64 lengths in a standard metric pool), 28-mile paved road bike, 5.3-mile trail run (Yes, it's really an Olympic: ( USAT Distances Defined ) Sprint Triathlon — 750-meter swim (32 lengths in a standard metric pool),14-mile paved road bike, 3.5 mile trail run Olympic Aquabike (swim bike done) — 1500 meter swim, 28-mile paved road bike Sprint Duathlon — 2-mile paved run, 14-mile paved road bike, 3.5 mile trail run Olympic Relay — team up with one or two friends to complete our Olympic Triathlon together Sprint Relay — team up with one or two friends to complete our Sprin