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Chicago 11 Hour Endurance Run

Willow Springs, United States • 16 May 2026

Event Information

The Chicago Yeti 7-11 Hour Endurance Run is a timed trail running event. It takes place in the Palos Preserves near Willow Springs, Illinois.

Course

The course consists of a 4-mile loop. The terrain includes single-track trails through restored forest, double-track paths, and rolling hills. The route offers views of local ponds and passes a historical site. A detailed course file is available online for participants.

Aid Station

A dedicated aid station provides hot dogs, snacks like Pixie Sticks and Honey Buns, crackers, chips, water, and electrolyte drinks. Participants are also welcome to bring their own cooler with personal food.

Logistics and Rules

The event is professionally timed. It is a cupless event; participants must bring their own reusable cup for drinks. There is an entrance policy for transgender and non-binary athletes, accepting their declared gender identity without requiring supporting evidence. The organizer states that refunds, deferrals, and transfers are not offered. Visit the organization's website for the most recent information.

United States Illinois Willow Springs

Race information

Website Registration
11 hr
11-Hour Endurance Run
7 hr
7-Hour Endurance Run
Visit the organization's website for the most recent information.
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