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Thunder Chicken 100K Stage Races

Eureka, United States • 15-17 May 2026

Thunder Chicken 100K Stage Races - Greensfelder County Park

The Thunder Chicken 100K Stage Races is a three day trail running stage event held Friday May 15 to Sunday May 17, 2026 at Greensfelder County Park, Beulah Shelter in Wildwood, Missouri. The park address is 4515 Hencken Road.

The event is organized as three consecutive stages that cover roughly 100 kilometers in total over local trail systems. Distances for each day are listed below.

  • Stage 1 - 21-ish Mi - Tour de Rockwoods Range
  • Stage 2 - 26-ish Mi - Tour de Rockwoods Reservation
  • Stage 3 - 25K-ish - Tour de Greensfelder

Runners traverse winding trails with sustained climbing and descending through the Rockwoods Reservation, Rockwoods Range, and Greensfelder park systems. The route includes several creek crossings, scenic vistas and bluffs, and stretches of dense forest.

The event weekend is presented as a multi-day group competition that includes community elements and shared trail experiences. There is information about fee assistance: the Trail Mix Fund may waive registration fees for participants who cannot afford entry and who identify as members of BIPOC or LGBTQ+ communities. Visit the organization's website for the most recent information.

United States Missouri Eureka

Race information

Website
26 mi
Stage 2: Tour de Rockwoods Reservation
21 mi
Stage 1: Tour de Rockwoods Range
25 km
Stage 3: Tour de Greensfelder
Visit the organization's website for the most recent information.
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