October ultramarathons in Michigan, United States

3.1-mile rolling hill loop with single-track, wide trails, grassy sections, bridge crossings, 24-hour format, heated indoor bathrooms, on-site camping

Two-loop 50k on rolling single track through Deep Lake Campground’s forest trails and autumn scenery

Point-to-point and out-and-back ultramarathon across Michigan’s lower peninsula, with varied single-track, gravel, limestone, and seasonal road terrain

24-hour backyard ultra with a 4.167-mile loop through Upper Peninsula woods, featuring gravel, rooty singletrack, rolling ski trails, and 289 feet of elevation

Looped singletrack through wooded trails at Pigeon Creek, centralized at the ski lodge, vibrant fall forests, 6- and 12-hour distance challenges

Timed races on 2-mile dirt and trail loops with loop count challenges, plus a Last One Standing endurance test on a flat gravel course

Symbolic 64-mile relay from Michigan’s Diag to the Sparty Statue, celebrating teamwork, accessibility, and the Michigan–Michigan State tradition

Scenic 4.167-mile loop in Sleepy Hollow State Park, with prairie, hardwood forest and pine, modest climbing, and classic last-runner-standing format

30-hour event on a 5-mile scenic trail loop around Caledonia and local schools, with night running options and on-course support