Illinois · Ozark

Shawnee Hills

Founded in 2017 at Camp Ondessonk in Shawnee National Forest, Shawnee Hills 100 runs three loops of roughly 32 miles each on a figure-eight route — 80% single-track, the rest fire roads, through sandstone canyon systems with rocks, roots, and creek crossings. Cedar Falls, the tallest free-falling waterfall in Illinois, and Jackson Falls both appear on course. August heat, humidity, copperheads, cottonmouths, and timber rattlesnakes are explicitly flagged in race materials. The cutoff is 33 hours. The 2024 edition recorded seven 100-mile finishers.