The Riley Trails 50K

Take on the Cal Crusher: a fun 30 hour endurance challenge in Caledonia on a scenic 5 mile loop. Log as many laps as you can, enjoy aid station support, and compete for top male and female mileage awards benefiting Type 1 diabetes research.

Join Ultra Bird on Nov 1, 2025 at Pigeon Creek County Park in West Olive MI for a scenic 5 km loop and events from 5K and 10K to ruck challenges and timed 6 hour and 12 hour races. Prizes, aid stations and proceeds support veteran and recov..

The Dirty Duel is a lively trail race at Robinette's Trails near Grand Rapids with two short but punchy courses featuring sand dunes, a corn maze and off trail sections. Reward yourself with cider, donuts and a unique buff or wooden medal.

Run the Ken O Sha trails along Plaster Creek at Twisted Trail, a looped course with 5K, 10K, 15K and a free 1 mile for all ages. Enjoy scenic fall trails, included shirts and friendly competition.

Run the Idema Explorers Trail from Grand River Park to Grand Ravines Park, with scenic river viewpoints where bald eagles are often seen. Pick a 10K, 5K or a 1 Mile kids fun run and support the Ottawa County Parks Foundation.

Hit the trails at Robinette's Apple Haus near Grand Rapids on June 20 for Wicked Worm, a technical singletrack and orchard trail run with 10K, 6 hour and 12 hour options. Bring a chair and enjoy breakfast and finisher swag.