August ultramarathons in Illinois, United States

Loop course through scenic park grounds with grass, gravel, and paved paths; aid stations and crew support at start and finish area

Looped park course on grass, gravel, and pavement with clockwise laps from the Laury Barn

Timed 3- or 6-hour run on a 1-mile loop around Watershed Nature Center, evening hours requiring a light source, limited to 140 participants

50-mile and 40-mile loop course through mature woodland, rolling terrain, and wide, runnable trails at Deer Grove East Forest Preserve

Looped course through Shawnee National Forest featuring 80% single-track dirt, creek crossings, rocky terrain, waterfalls, and 3200 ft elevation per loop.

Crushed gravel, dirt, and wood-chip trails winding through forests and fields with minimal elevation gain, two bridge crossings each lap, and riverbank views

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