Thunder Chicken 100K Stage Races

St. Louis’s only three-day trail running stage race — the Thunder Chicken 100 Stage Races!

Hosted at Greensfelder County Park (Beulah Shelter) in western St. Louis County, Missouri, this event was created for adventure seekers who want a full weekend of challenge, community, and unforgettable trail running. Participants come together for tough races, great fellowship, and the chance to experience some of the very best trails STL has to offer!

Over the course of three days, runners will experience some of the most challenging terrain and scenic trail systems STL West County has to offer! Winding, climbing and descending through the rugged Rockwoods Reservation, Rockwoods Range and Greensfelder park systems with several creek crossings, past scenic vistas and bluffs and through dense forest.

May 15, 2026 - Stage 1 - 21-ish Mi - Tour de Rockwoods Range
May 16, 2026 - Stage 2 - 26-ish Mi - Tour de Rockwoods Reservation
May 17, 2026 - Stage - 25K-ish - Tour de Greensfelder​