50K ultramarathons in Illinois, United States in 2026

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

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

Multi-loop ultramarathon offering official finishes and awards at 50K, 100K, 150K, or 200K; progressive distances with tiered medallion and buckle rewards

50K trail race with Triple Crown options up to 85K, touring wooded park trails from Red Oak picnic area in Rock Cut State Park

50K trail course with dirt, rocks, roots, climbing, gravel, and occasional pavement; varied terrain with elevation changes and technical footing.

7.85-mile loop from Meadows Park with singletrack, grassy meadows, and gravel; moderate elevation gain totaling 6,200 feet over the 100-mile distance

Flat, fast point-to-point course along the scenic Hennepin Canal from Sterling to Colona, featuring historic locks, lift bridges, and autumn farmland views

Flat, fast crushed limestone trail winding through forests and wetlands with bridges, minimal road crossings, and occasional water from flooding

Grassy paths, dirt single track, creek crossing, and demanding hills on private land between Fox Ridge State Park and Warbler Ridge in Charleston, IL

Single-track trails with elevation changes in the Palos Trail system, double out-and-back route passing historic Chicago Pile-1, playful race theme

Multiple out-and-back segments along the Lakefront running path, mostly asphalt with some concrete, among the flattest 50k and 50-mile courses

Wooded, unpaved trails through the Palos/Sag Valley Trail Systems in the Cook County Forest Preserve

Picturesque course along Des Plaines River and Casey Trails with pavement, wooded paths, crushed limestone, and rolling hills; potential winter conditions