Articles

Belgian Ultrarunner Karel Sabbe's Record-Breaking Pacific Crest Trail Run Showcased in New YouTube Documentary

Explore Karel Sabbe's record-breaking Pacific Crest Trail run in a riveting documentary. Jour..

Trail Running: How it Can Help Reduce Stress and Anxiety

Trail running is an effective way to reduce stress, anxiety, and improve physical and mental he..

Trail Running vs. Road Running: Which One Is Right For You?

When it comes to running, there are two primary options to choose from: trail running and road..

Thunder Chicken 100K Stage Races

Name: Thunder Chicken 100K Stage Races
Start: 2026-05-15
End: 2026-05-17
Location: Eureka

Eureka, United States • 15-17 May 2026

Thunder Chicken 100K Stage Races

Thunder Chicken 100K Stage Races is a three-day trail running stage race held May 15 to May 17, 2026 at Greensfelder County Park, Beulah Shelter, 4515 Hencken Road, Wildwood, Missouri. The event takes place in western St. Louis County and is presented by Terrain Trail Runners.

Over the weekend participants follow routes that use trail systems in Rockwoods Reservation, Rockwoods Range and Greensfelder park systems. The courses traverse winding singletrack with sustained climbs and descents, several creek crossings, and passages past scenic vistas and bluffs through dense forest. The event is described as St. Louis’s only three-day trail running stage race.

Stage distances are listed as:

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

Registration information is provided for the race and the Trail Mix Fund may waive registration fees for applicants from BIPOC or LGBTQ+ communities. Reports and photo galleries from prior editions are maintained by the organizer. Visit the organization's website for the most recent information.

United States Missouri Eureka

Race information

Website

100 km

Thunder Chicken 100k Stage Races Total

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.

Trail runs nearby

Saturday May 2

The Spring Sprung Ruck and Half Marathon

This spring event in Queeny Park offers four distances on rolling gravel trails, including a ruck division. Participants receive a finisher's medal, t-shirt, and professional timing. Top finishers in each age group receive awards.

Saturday May 16

The Piasa

Trail races at Pere Marquette State Park near Grafton, IL offering 12.5K, 25K and 50K on technical bluff trails with solo and buddy divisions. Awards include handcrafted artwork and the event follows a strict no refund policy.

Saturday May 16

Operation Granite

Granite City

Mud Run / Obstacle Run

6 mi

Operation GRANITE X at Tri-Township Park on May 16, 2026 features 6 mile loops made of three two mile laps. Two divisions are offered, one with escalating weight and one focused on endurance.

Saturday Jun 6

Mud Factor - St. Louis

Eureka

Mud Run / Obstacle Run

Mud Factor returns to Brookdale Farms in Eureka, MO on June 6, 2026 with Adult and KIDZ Family Waves, required signed waivers and photo ID for adults, and a $10 cash spectator fee for festival access.