Thunder Chicken 100K Stage Races

The Thunder Chicken 100K Stage Races offer an unparalleled multi-day trail running adventure, making it St. Louis's only three-day trail running stage race. Set for May 15-17, 2026, in Wildwood, MO, this event is based at the scenic Beulah Shelter in Greensfelder County Park and is designed for adventure seekers craving a full weekend of challenging trails, community spirit, and unforgettable scenery. Runners can tackle the full 100K experience over three days, or opt for individual stages: a demanding 21-mile "Tour de Rockwoods Range," a rugged 26-mile "Tour de Rockwoods Reservation," or a flowing 25K "Tour de Greensfelder." Typical race day conditions in mid-May present comfortable highs around 77F and lows around 55F, with a modest 19% chance of precipitation, creating ideal running weather.

The course itself is a highlight, winding through the rugged Rockwoods Reservation, Rockwoods Range, and Greensfelder Park systems. Expect a dynamic mix of terrain including steep grades, flowing singletrack, rolling hills, and plenty of technical sections with rocks, roots, and creek crossings that demand constant focus. Each stage presents its own unique challenge and impressive elevation gains, culminating in over 10,000 feet for those completing the full 100K. Beyond the physical test, runners will be treated to breathtaking scenic vistas, bluffs, and dense forests throughout the journey.

This event stands out not just for its challenging trails but also for its vibrant atmosphere and commitment to sustainability. Enthusiastic and helpful volunteers staff fully supported aid stations, strategically placed throughout each stage, though runners should remember it's a cup-free event and bring their own hydration receptacles. Beyond the race, participants praise the excellent organization, friendly community, and the genuine fellowship that defines the Thunder Chicken experience. It's an event that challenges even seasoned trail runners while fostering a welcoming environment, further enhanced by its participation in the Trail Mix Fund, which supports diversity in trail racing. Finishing the full 100K earns a custom belt buckle, while individual stage finishers receive custom medals, commemorating an epic weekend on St. Louis's finest trails.