Thunder Chicken 100K Stage Races Eureka, MO   May 2, 2025

St. Louis’s very own three-day trail running stage race – Thunder Chicken 100 Stage Races is presented by Terrain Trail Runners!

Thunder Chicken 100 Stage Races are an annual gathering at Camp Wyman in Eureka, Mo, in western St. Louis County, Missouri. The event was created for many adventure seekers, reuniting for a weekend of challenging races, fellowship and the opportunity to become one of the Thunder Chicken 100K PEOPLE!

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.

Stage 1 – 20-ish Mi – Tour de Rockwoods Range
Stage 2 – 26-ish Mi – Tour de Rockwoods Reservation
Stage 3 – 25K-ish – Tour de Greensfelder​

*Included in your ALL 3 DAYS – RACE DAY REGISTRATION:
– Custom Finisher Buckle
– FREE Digital Race Photo Downloads
– Post-Race Grub and Beer!