Lace up for an unforgettable challenge at the CHICAGO 7-11 Hour Endurance Run, set to unfold on May 16, 2026, in the scenic Palos Preserves of Willow Springs, IL. This unique event, hosted by Yeti Trail Runners, offers participants the choice of an 11-hour or 7-hour endurance format, blending serious trail running with a distinct sense of camaraderie and playful chaos. Born from "skatepark vibes and late-night gas station feasts," the Yeti 7/11 experience promises a celebration of looping trails and memorable moments in Chicago's natural playground.

The race features a well-marked 4-mile loop course, guiding runners through a "Chicago-style sampler" of terrain. Expect a mix of single-track bliss under a canopy of restored forest, double-track sections within the historic Palos Preserves, and rolling hills designed to keep your quads engaged. Quick, runnable sections are interspersed, accommodating all skill levels. Along the way, runners will discover special "Chicago touches," including fresh pond views and a pass by the world's first nuclear reactor site. Typical race day conditions in mid-May often bring highs around 74°F and lows around 50°F, with approximately a 20% chance of precipitation, creating ideal weather for an endurance effort.

A highlight of the CHICAGO 7-11 Hour Endurance Run is the legendary "7/11 Aid Station," a signature Yeti offering with a Windy City twist. Forget traditional ultra fare; here you’ll find gourmet hot dogs, Pixie Stick fuel, Honey Bun delicacies, trailside crackers, chips, water, and electrolyte drinks to keep you going strong. Runners are encouraged to bring their own reusable cup as this is a cupless event, and personal coolers are welcome for specific dietary needs. This event is more than just a race; it's an inclusive community experience focused on enjoyment, shared stories, and the delightful absurdity of pushing your limits, one loop and one hot dog at a time.