Ann Arbor Tri, Du, & Aquabike
About this race
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 Sprint Triathlon together
Park Entry
A State Park permit or Recreation Passport is needed to enter Pinckney Recreation Area. Visit the Michigan Department of Natural Resources here for pricing and more information.
Host Club
The Ann Arbor Tri Club and the University of Michigan Tri Team will be your host clubs for this event. We are grateful to them for providing volunteers and bringing sharing their passion, dedication, and spirit to the Ann Arbor Tri!
To learn more about Ann Arbor Tri Club, CLICK HERE.
To learn more about The University of Michigan Tri Team CLICK HERE.
To learn more about our club sponsorship program, CLICK HERE.
Course
Please note that in the interest of safety, all courses are subject to change at any time at the discretion of the race director.
750m Swim Course Map (2x for Oly)
Duathlon 1st Leg
Sprint Bike Course Map
Olympic Bike Course Map
Sprint and Mini Run Course
Olympic Run Course
USA Triathlon Distance Defined
Start Times
While start times are noted in the event information, all start times are subject to change. All participants must be at the mandatory race meeting on the beach at 7:15 AM and ready to race by 7:30 AM. An official race schedule will be sent in the pre-race information.
Post-Race Party
Stick around post race for food and festivities! Our Epic staff and volunteers will be cooking up pancakes, breakfast burritos, and more for race participants.
Zero Waste
The event is a Leave No Trace event. Learn more about our race-day recycling and composting efforts here. Want more information about running a great race and leaving no trace? Click here to visit Happy Planet Running!
→ Read the 2023 Ann Arbor Tri sustainability report here!
Pick your distance
Triathlon
Olympic Triathlon
1500m swim, 28-mile paved road bike, 5.3-mile trail run
Sprint Triathlon
750m swim, 14-mile paved road bike, 3.5-mile trail run
Sprint Relay
Relay: Rock this race with a team of 3 or 2.
Olympic Relay
Relay: Rock this race with a team of 3 or 2
Aquabike
Olympic Aquabike
Aquabike - 1500m swim, 28-mile paved road bike
Duathlon
Sprint Duathlon
Duathlon — 1.5 -mile trail run, 14-mile paved road bike, 3.5 -mile trail run
Swimming
Open Water 1 Mile Swim
Typical race-day weather
Based on 12 years of Open-Meteo archive data for this event's race dates in Gregory, plus the 3 days either side.
The sun rises at 6:08 AM and sets at 9:14 PM local time (EDT) in Gregory on July 10, 2027 — 15h 06m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Ann Arbor Tri, Du, & Aquabike
Other races near Gregory
Different organizers, within 40 miles, in the next three months
2026 HPWC Orphan Run 4 Hope
Stockbridge Cross Country Invitational
1st Annual Ostomy 5k, Ann Arbor MI
TimberTown B2B Trailfest
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 2 Gregory events
Spotted something wrong? Tell us and we'll fix it.