Tri Millennium
About this race
Tri Millennium is one of West Michigan's longest-standing multi-sport events and a favorite among many local athletes. Located in the beautiful Millennium Park in Grand Rapids, MI, Tri Millennium offers an Olympic and Sprint distance triathlon, duathlon, and aquabike. Our Olympic race features a 1,500-meter swim, 24.8-mile bike, and 6.2-mile run. Our Sprint distance race features a 750-meter swim, 12.4-mile bike, and 3.1-mile run. Relay options are available for both races.
The inland waters of Millennium Park are typically calm and pleasant, the surrounding roads follow the rolling terrain for the bike course, and the paved trails through the park are flat and fast, making Tri Millennium a great race for the elite athlete looking for a summer "A" race, a beginner athlete looking to complete their first triathlon, or a primer race for those prepping for the MiTi half or full triathlon later in August. With professional timing from Trivium Racing and a full complement of volunteers and support on race day, Tri Millennium is a race for everyone.
Tri Millennium's charity partner is Bridge Street Ministries, a Christian urban youth ministry in Grand Rapids' West Side, working to support the spiritual, academic, and social development of inner-city youth, leading them with a vision of hope and restoration and believing that they will be the future leaders of our community. 100% of the donations from Tri Millennium will go to support this important work. For more information, visit bsmgr.org.
Pick your distance
Triathlon
Sprint Tri Relay (3 Person)
Swim 750 meters Bike 20k Run 5k
Kids Tri (Ages 6-8)
50 yd swim 1.5 mile bike 1k run
Kids Tri (Ages 12-15)
About a 100 yd swim 3 mile bike 2k run
Sprint Tri
Swim 750 meters Bike 20k Run 5k
Sprint Tri Relay (2 Person)
Swim 750 meters Bike 20k Run 5k
Olympic Tri
Swim 1.5 km Bike 40 km Run 10 km
Olympic Tri Relay (2 Person)
Swim 1.5 km Bike 40 km Run 10 km
Olympic Tri Relay (3 Person)
Swim 1.5 km Bike 40 km Run 10 km
Duathlon
Sprint Duathlon
Run 2.5k Bike 20k Run 5k
Olympic Duathlon
Run 5 km Bike 40 km Run 10 km
Aquabike
Sprint Aquabike
Swim 750 Meter Bike 20 km
Olympic Aquabike
Swim 1500 meters Bike 40 km
Typical race-day weather
Based on 9 years of Open-Meteo archive data for this event's race dates in Walker, plus the 3 days either side.
The sun rises at 6:26 AM and sets at 9:13 PM local time (EDT) in Walker on July 24, 2026 — 14h 46m 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 — Tri Millennium
Other races near Walker
Different organizers, within 40 miles, in the next three months
The Micro: Breaking 4
Hot Cider Hustle - Grand Rapids Half Marathon, 10K & 5K
West Side Donut Dash
University of Michigan Health-West Grand Rapids Marathon
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, 7 Walker events
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