Chicago 11 Hour Endurance Run
Willow Springs, United States • 16 May 2026
Event overview
The Chicago Yeti 7-11 Hour Endurance Run is scheduled for May 16, 2026, at 9800 Wolf Rd, Willow Springs, IL 60480. The event is a timed endurance run with professional timing provided by ZEN ARCADE TIMING, which records lap counts and provides real-time results and digital displays. The race format uses repeated loops on a measured course.
Course and policies
The loop length is 4 miles. The course includes single-track sections under restored forest canopy, double-track through Palos Preserves, rolling hills, and short runnable sections. Course markings are described as clear. Notable course features include views near a historic reactor site and pond areas. The event provides an on-course aid station stocked with hot dogs, Pixie Sticks, honey buns, crackers and chips, water, and electrolyte drinks; participants may bring a cooler for specific dietary needs.
This is a cupless event; runners must bring a foam or collapsible camp-style cup for hot liquids and a reusable cup for other drinks. Accessibility policies state athletes with disabilities must be able to run the course and finish within a 30-hour cutoff; tethers, leg prosthetics, crutches, braces, or poles may be allowed with approval from the race director. The organizer’s refund policy specifies that refunds, deferrals, and transfers are not offered. Visit the organization's website for the most recent information.