Trinity Health Probility Ann Arbor Marathon & Half-Marathon

Climate Week 5K & 10K presented by the University of Michigan and City of Ann Arbor

Running toward a sustainable future

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Join us in downtown Ann Arbor for the 15th running of the Trinity Health Probility Ann Arbor Marathon!

Choose your challenge: marathon, half marathon, marathon relay, Climate Week 10K, Climate Week 5K, or one of our free kids races. Whether you're walking your first 5K or racing your 50th marathon, there's a place for you on the starting line.

The Climate Week 5K and 10K bring runners, walkers, the University of Michigan, and the City of Ann Arbor together around a shared goal: creating a healthier, more sustainable future for our community and our planet.

All distance events start in downtown Ann Arbor. From there, participants experience the vibrant streets of downtown, the University of Michigan campus, and some of Ann Arbor's most beautiful natural areas — including the Huron River, Gallup Park, and Nichols Arboretum — before returning for a spectacular downtown finish. The USATF-certified marathon course is a qualifier for both the Boston Marathon and the TCS New York City Marathon.

Every Body. Every Pace. Every Race.

If you're coming in from out of town, out of state, or out of the country — or even if you live in the Ann Arbor area — you'll enjoy discovering Tree Town USA! Ann Arbor features locally owned and operated restaurants and cafes, independent bookstores, theaters, art galleries, and museums (including the University of Michigan Museum of Art), all within reach of the Ann Arbor Marathon.

Learn more at VisitAnnArbor.org !

 

Remembering Mike Highfield (1947–2026)

The Ann Arbor Marathon family is saddened to share that our founder, Mike Highfield, passed away on July 22, 2026, at the age of 78.

Mike and his wife, Andrea, created the Ann Arbor Marathon, along with other charitable running events in town like Big House Big Heart. They wanted to give this community a race worth being proud of. Every runner who crosses our start line is running on a course that began as Mike's idea.

Running was a lifelong passion for Mike. He took up the sport seriously in the 1970s and went on to complete 31 marathons, twelve of them in Boston. He later became a triathlete, winning his age group many times. He also became a national leader in the sport. He served as President of USA Triathlon and helped assemble America's first Olympic triathlon team for the Sydney 2000 Games.

Off the course, Mike was a proud Ann Arbor lawyer for 40 years and a University of Michigan graduate. He was a devoted Wolverine fan and held football and basketball season tickets for half a century. He and Andrea attended the 2026 NCAA basketball championship game and watched Michigan win the title, a moment his family says meant a great deal to him.

We are grateful for the foundation Mike built, and we'll carry his love of running forward every race day. Our thoughts are with Andrea, his children and stepchildren, his grandchildren, and everyone who loved him.

His family has asked that memorial donations go to the Tunnel to Towers Foundation at T2T.org.

This year's race will be run in Mike's memory, and we'll pause for a moment of silence before the start.