July 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

Scenic Illinois River trails with 100 mile, 100k, and 50k options; roughly 23,500 feet of elevation gain and rustic woodland terrain at Camp Wokanda

Challenging looped course through wooded ridges and river valley along Illinois River Bluff Trail, with significant elevation gain and summer heat.

33.5-mile loop through seven western suburbs, largely on bike paths, with a steady runnable surface and point-to-point feel