6hr ultramarathons in Illinois, United States in 2027

Cross country trails winding through Caldwell Woods and Bunker Hill, 5 km loops on grassy or paved terrain, ultra and team options, winter forest setting

Looped course on paved paths with rolling hills, timed format, basecamp aid station, and crew support permitted

Fast, flat 1.3-mile loops on paved pedestrian paths within Herrin Sports Complex, open grounds backdrop, six-hour timed endurance format

Successive lap format on winding trails with strict hourly cutoffs, testing stamina and recovery management