Chicago 7/11 Hour Endurance Run
Willow Springs, United States • 16 May 2026
Chicago 7/11 Hour Endurance Run
The Chicago 7/11 Hour Endurance Run is a timed trail event on May 16, 2026, held at 9800 Wolf Rd, Willow Springs, IL. The event uses a looped course and records laps and real-time results with professional timing by ZEN ARCADE TIMING.
The loop length is 4 miles. The route includes single-track trail under a restored forest canopy, double-track sections through the Palos Preserves, rolling hills, and several quick runnable sections. The course has marked trails and passes near the site of the world’s first nuclear reactor and pond views.
A central aid station provides a variety of snacks and drinks including gourmet hot dogs, Pixie Sticks, honey buns, crackers and chips, water, and electrolyte drinks. Participants may use personal coolers to store food for specific diets.
The event is cupless. Each participant must bring a reusable cup for hot liquids and for other drinks to reduce race waste. Visit the organization's website for the most recent information.