September ultramarathons in Illinois, United States

Multi-loop ultramarathon offering official finishes and awards at 50K, 100K, 150K, or 200K; progressive distances with tiered medallion and buckle rewards

50K trail race with Triple Crown options up to 85K, touring wooded park trails from Red Oak picnic area in Rock Cut State Park

Scenic 1-mile paved loop in a 58-acre city park, rotating hourly challenges, 6- or 12-hour format, solo or relay options, central aid station and vendor

4-mile loop on Boyscout Trail with 342 feet of elevation gain per lap, rugged terrain, and relentless hills at Ferne Clyffe State Park

50K trail course with dirt, rocks, roots, climbing, gravel, and occasional pavement; varied terrain with elevation changes and technical footing.

8-hour ultra with flexible pacing on a 1.65-mile limestone and asphalt loop, featuring flat stretches, steep climbs, and rolling hills at Limestone Park

7.85-mile loop from Meadows Park with singletrack, grassy meadows, and gravel; moderate elevation gain totaling 6,200 feet over the 100-mile distance

1.2-mile loop course, flexible durations up to 24 hours, single aid station, relaxed community atmosphere, nighttime running with quiet hours enforced