12hr ultramarathons in Illinois, United States

Half-mile pine forest loop in Lowell Park, continuous 6, 12, or 24-hour format with self-supported setup and solo or team options

Challenging 12-hour last runner standing on a 4.1-mile rugged trail loop amid summer heat at Comlara parks, testing endurance, pacing, and strategy

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

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

2.07-mile gravel and concrete loop at Arrowhead Lake Campground with minimal elevation, designed for speed and high mileage in Johnston City, IL.

Looped trail course in Kinsey Park with a last-runner-standing format, emphasizing mental toughness, strategic pacing, and accumulating fatigue