Chicago 11 Hour Endurance Run

Chicago Yeti 7-11 Hour Endurance Run is held at 9800 Wolf Rd, Willow Springs, IL. The race centers on a four-mile loop through Palos Preserves, featuring a mix of single-track forest, double-track trails, rolling hills, and quick runnable sections that suit a range of paces. The atmosphere blends skatepark vibes with trail-running camaraderie and a playful, chaotic edge focused on endurance and fun.

It’s a timed event offering 7- and 11-hour options, with precise lap counts provided by Zen Arcade Timing. Special features include the cupless policy, The Famous 7/11 Aid Station with snacks, and clear trail markings (GPX available on UltraPacer). Visit the organization's website for the most recent information.