Thunder Chicken 100K Stage Races

MAY
15-17
2026
Three days of trail stages at Greensfelder County Park near Wildwood Missouri, with roughly 21 miles, 26 miles and 25K of technical singletrack, creek crossings and significant elevation gain. The event is cup free and includes stage medals and a belt buckle for three day finishers.
15-17 May 2026
26 miles 21 miles 25 kilometers

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Thunder Chicken 100K Stage Races : Greensfelder County Park, Wildwood MO

The Thunder Chicken 100K is a three day trail running stage event hosted at Greensfelder County Park, Beulah Shelter, in Wildwood, Missouri. The race links several adjacent park systems and trail networks in west St. Louis County, including Rockwoods Range and Rockwoods Reservation.

Distances

  • All 3 Days roughly 100 kilometers total
  • Stage 1 about 21 miles
  • Stage 2 about 26 miles
  • Stage 3 about 25K

Stage 1 traverses Fossil Ridge, Deer Run and Rockwoods Range singletrack with creek crossings and varied footing, and totals about 2,650 feet of elevation gain. Stage 2 covers the Beulah Trail length plus Green Rock, Rock Quarry and the Lime Kiln loop, mixing flowing singletrack with long, steep climbs and about 4,150 feet of cumulative gain. Stage 3 links DeClue, Dogwood, Deer Run and Eagle Valley, features faster flowing singletrack and a final hard climb of roughly 340 feet, totaling about 1,850 feet of gain.

Event logistics note at least one aid station per stage. The event follows a cup free, zero waste approach so participants are expected to use personal drinking receptacles and a mess kit for post race food. Race registration includes a custom t-shirt, stage medals, and a custom belt buckle for three day finishers. Post race refreshments include snacks, beer, and a taco bar on the final day. Camping is available within the park and lodging exists in nearby towns. Visit the organization's website for the most recent information.

26 mi
Stage 2: Tour de Rockwoods Reservation
21 mi
Stage 1: Tour de Rockwoods Range
25 km
Stage 3: Tour de Greensfelder