Thunder Chicken 100K Stage Races

Thunder Chicken 100K Stage Races

Thunder Chicken 100K Stage Races is a three day trail running stage race held May 15-17, 2026, hosted by Terrain Trail Runners at Greensfelder County Park near Wildwood, Missouri. The event uses the Beulah Shelter as its base and links Greensfelder with the Rockwoods trail systems.

Distances offered:

• All 3 Days - Thunder Chicken 100K
• 21-ish miles (Stage 1)
• 26-ish miles (Stage 2)
• 25K-ish (Stage 3)
• Pick 2 options combining individual stages

Stage 1 (about 21 miles) traverses Fossil Ridge, Deer Run and Rockwoods Range trails with roughly 2,650 feet of cumulative elevation gain, rocky and rooty footing, and multiple creek crossings. Stage 2 (about 26 miles) covers extensive singletrack and steep climbs in Rockwoods Reservation with about 4,150 feet of gain and technical sections. Stage 3 (about 25K) highlights Greensfelder flow trails with 1,850 feet of gain and a final steep climb before the finish.

There will be at least one aid station per stage. Race registration includes a custom cotton/poly t-shirt, stage medals, and a custom belt buckle for all three day finishers. Post-race food and beer are provided; Stage 3 features a taco bar. The event is cup free as part of a zero waste pledge and partners with the Trail Mix Fund to waive fees for some applicants. Camping options exist at Greensfelder Park including tent and RV sites and nearby towns offer additional lodging. Visit the organization's website for the most recent information.