HalfRuns
Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk

Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk

Ann Arbor's Probility Marathon offers a scenic tour through campus and riverfront paths.

Race Date

Oct 3, 2026

Location

Ann Arbor, MI

Solid Pick60

Quick facts

Date
Saturday, October 3, 2026
Location
Ann Arbor, Michigan
Distance
Half marathon (13.1 mi) + 26.2 Miles, 13.1 Miles, 10K, 5K, 0.5 Miles, 0.262 Miles, 6.2 Miles, 3.1 Miles
Course
Loop Course
Terrain
Road
USATF certified
Not listed
Finishers on record
9,374

Highlights

Good For

BQ RelevantPR FriendlyDestination Worthy

Atmosphere

Local CommunitySpectator SupportGreat SwagWell Organized

Course

Fast FlatScenic Route

The Experience

The Trinity Health Probility Ann Arbor Marathon, now in its 16th running, invites runners to "Run Tree Town" while supporting the "E-Race the Stigma" initiative. This event offers a variety of distances, from a 5K to a full marathon, making it accessible for all levels of participants.

The course begins in downtown Ann Arbor, guiding runners through the vibrant city streets before venturing onto the picturesque University of Michigan campus. The longer distances, including the half and full marathons, extend to scenic stretches along the Huron River and through Gallup Park and Nichols Arboretum, showcasing the natural beauty of the area before returning to a downtown finish.

This USATF-certified course is a qualifier for both the Boston and New York City Marathons, attracting runners from across the country. With a median field size of around 1,500 finishers, the event offers a chance to explore Ann Arbor's local culture, from its independent shops to its museums, making it a worthy destination race.

Race-provided description

THE PROBILITY ANN ARBOR MARATHON Take to the scenic streets of Ann Arbor to help E-Race the Stigma with the 16th running of the Trinity Health Probility Ann Arbor Marathon. With a variety of running events that appeal to all ages and abilities, you’ll find that the Ann Arbor Marathon is your ideal fall race event, whether you’re walking your first 5K or running your 50th marathon.   RUN TREE TOWN. All distance events — marathon, marathon relay, half marathon, 10K, and 5K — start in downtown Ann Arbor at 209 S Ashley St, Ann Arbor, MI 48104. Run through the vibrant streets of downtown Ann Arbor, then wind your way through the panoramic University of Michigan campus. The marathon, half-marathon, and 10K courses also encompass stretches along the Huron River and Gallup Park and through Nichols Arboretum before returning to campus and downtown. All races end with a spectacular downtown finish. The Ann Arbor Marathon course is USATF certified and serves as a qualifier for both the Boston and New York Marathons.

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! E-RACE THE STIGMA We are continuing our charity takeover! In partnership with the Rotary Club of Ann Arbor we are committing all our fundraising efforts to organizations that help and support mental health and/or issues associated with mental health and play an active role in reducing the stigma surrounding mental illness.  You will learn about them during registration, and we hope you will choose to support one or many to help E-Race the Stigma!

Logistics

Race Day

Saturday, October 3, 2026

Start Time

8:00 AM

Giveaway

Choice of long or short-sleeved T-shirt

Start Location

209 S Ashley St, Ann Arbor, MI, 48104

Directions

Course Info

Course Type

Loop Course

Terrain

road

Scenery

Urban, Lake River

Surface

Paved

Difficulty

Ultra-Flat

Net Drop/km

0 m (Flat)

Separation

0.0%

Also Offers

26.2 Miles13.1 Miles10K5K0.5 Miles0.262 Miles6.2 Miles3.1 Miles

Quality Score

Solid Pick60
Methodology
Heritage20/20

11 years running

Size15/15

~1,548 finishers a year

Momentum0/5

shrinking

Loyalty10/20

10% returning runners

Course & details8/15

5 timing sources · 3 photos

National draw0/10

runners from 1 state

Front-pack speed5/5

winner 1:12:01

Weather2/10

typical high 73°F

Race Day Weather

5-year historical avg

Start (Low)

53°

Afternoon (High)

73°

Warm — hydration strategy is key, start conservatively

0.1"

Precipitation

9 mph

Wind

72%

Humidity

Historical Finish Times

How 9,374 finishers actually crossed the line across 11 years.

Most recent

2025

Total finishers

9,374

Median time

2:09:04

Latest turnout

818

States

45

10%
25%
75%
90%
1:05p50 median ≈ 2:055:10

Turnout by year

20172025

'17'18'19'21'22'23'24'25
See full results

Hover the histogram to inspect specific finish times.

Race Photos

Frequently asked

When is the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk?

The Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk is held on Saturday, October 3, 2026, starting at 8:00 AM.

Where does the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk take place?

It takes place in Ann Arbor, Michigan.

What distances does the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk offer?

The half marathon (13.1 miles), plus 26.2 Miles, 13.1 Miles, 10K, 5K, 0.5 Miles, 0.262 Miles, 6.2 Miles, 3.1 Miles.

Is the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk course flat and good for a PR?

The Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk is a ultra-flat, loop course course.

How many people run the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk?

HalfRuns has finish records for 9,374 runners who have completed the Trinity Health Probility Ann Arbor Marathon: 5K • 10K • Half-Marathon • Full Marathon • Marathon Relay • Half-Marathon Walk.

HalfRuns editorial — independent, no paid placement.

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