2026 Tri Millennium

Want to lower race costs? Volunteer!

At most Tris4Health and Boundless Race & Ride Company events, volunteering earns vouchers for future races. Choose a shift, register, and rack up vouchers—values depend on the role, and you can combine them at checkout.

You have a lot of racing shirts.  Don’t need another one?  Select the shirtless option during the registration process to save $5.  It’s not much, but it all adds up!

Please read all of the information below before registering. 

• This race is subject to Tris4Health’s Risk-Free Racing Policy.
• Refunds are available 60 days or more before the date of your race.
• Between 60 days and 1 week out from event, you can defer your entry and claim a voucher/credit towards a future Tris4Health or Boundless Race & Ride Company event worth the value of your original entry fee (minus any fees from the registration platform).  This must be used within 1 year of your original purchase date.
• In the event the Event is delayed, modified or cancelled for any reason, including but not limited to acts of God or the elements (including without limitation, wind, rough water, rain, hail, lightning, hurricane, tornado, earthquake), acts of terrorism, fire, or any other cause beyond the control of Tris4Health, there shall be no refund of the entry fee or any other costs incurred in connection with the Event.
• Transfers to a higher-priced race at the same event are acceptable, but will require paying the price difference. Transfers to lower-priced races at the same event are acceptable, but you will not receive a refund. Email info@tris4health.com to request the transfer.

Tris4Health reserves the right to modify the maximum number of participants in each race.

“Tris4Health” is the multisport focused brand under Michigan Endurance Holdings, LLC, which also owns the “Boundless Race & Ride Company” brand.

Since its inception in 2019 with only two multisport events, Michigan Endurance Holdings has grown to produce over 20 events each year. All our cycling events are organized under the Boundless Race & Ride Company brand while our running and multisport events are produced under the Tris4Health brand. We maintain the same team and standards across both brands.

In the event of an emergency or the need of Tris4Health to communicate important information on event-day, please stay tuned to Tris4Health’s social media accounts on Facebook, your email, and venue PA announcements.

Upon finishing athletes can expect to receive the following at the post-race food tent: bananas, oranges, cookies, bagels, chips, and more. We will also have a variety of Pepsi products and Gatorade. Water will be distributed at the finish line.

Volunteers are critical to a safe a successful event! If you, a friend, a family member, or your organization can spare time to volunteer at one or multiple shifts, your time is greatly appreciated. There are flexible shifts available with numerous opportunities to participate, including supporting course aid stations, registration, finish line and more. All volunteers will be provided with a meal and shirt for their time.

Click here to view the available positions.

Tris4Health events could not be executed without the support of our volunteers, so thank you in advance for the part you will play in helping our athletes chase their goals/dreams and achieve competitive excellence. If you have any questions or run in to any issues when registering as a volunteer, please reach out to volunteer@tris4health.com.

July in Michigan is great but can be warm!  The average temperature for this time of year is 65 degrees at 7am and 80 degrees at 3pm.

Water Temperatures

Water temps are usually in the upper 70’s to low 80’s. The lake is shallow and it is late-July in Michigan.

This event is held at Millennium Park recreation area.

Millennium Park is the largest urban park in West Michigan, located on the southwest side of Grand Rapids. Millennium Park connects four of the major cities in the area together, including Grand Rapids, Wyoming, Grandville, and Walker. The address is: 1415 Maynard Ave SW, Walker, MI 49534.

For more information, please visit https://www.kentcountymi.gov/1765/Millennium-Park

There is plenty of parking on-site. Parking attendents will be on-hand to assist on race day.

From world-class attractions and outdoor recreation to nationally ranked food and craft beverage scenes – Grand Rapids, Michigan is filled with unexpected surprises.

Discover why we’re America’s Best Beer City, the nation’s Craft Beverage Capital, and a Top 20 U.S. Foodie City. Get an eyeful of spectacular art and an earful of live music. Explore our endless opportunities for family fun. Make your travel dreams come true in Grand Rapids!

For more information , please visit https://www.experiencegr.com