Chicago 11 Hour Endurance Run

Summer Trail Classic takes place on August 24, 2025 at Paul Douglas Forest Preserve in Hoffman Estates, Illinois. The event offers three trail distances: approximately 4 miles, 9.5 miles, and 13 miles, forming the third stop in the Dick Pond Athletics Darn Tough Trail Race Series. Runners navigate t..

Naperville Trails Half Marathon & 10K takes place in the Wheaton/Naperville area of Illinois, with a course on the crushed limestone trails of the Danada Forest Preserve. Runners can choose a half marathon or 10K distance on a flat, fast route that finishes around the horse race track on grass. The..

Timely Nonsense is an urban ultramarathon held at a 58-acre park in Chicago, at the intersection of California and Montrose. The course features a 0.75-mile paved loop that runners complete for the 6-hour or 12-hour timed events. An aid station at the Start/Finish provides typical ultrarunning fare,..

Half Day at the Lake is a unique ultra-running event held in Evanston, Illinois, featuring 6- and 12-hour race options. The race takes place on a scenic 2-mile loop along Chicago’s north shore lakefront path, passing through Evanston’s lakefront and Northwestern University’s campus. The course is a..

Palos Park Spooky Shuffle 2025 is a 5K and 10K trail run/walk held at Swallow Cliff South Forest Preserve in Palos Park, IL, organized by the Palos Park Department of Recreation & Parks in partnership with the Forest Preserves of Cook County. Runners traverse the Sag Valley Trail System on wide, unp..

Fancy Nonsense 25k/50k is a whimsical ultramarathon organized by CUSS Running, held near Chicago at Red Gate Woods in the Palos Trail System (Willow Springs/Lemont, IL). The course is a 5.5-mile mostly runnable single-track loop, repeated to reach 25k or 50k. Expect a playful, mischievous atmosphere..