Three Day Trail Running Stage Race
St. Louis, MO Very Own Three Day Trail Running Stage Race - Thunder Chicken 100 Stage Races is presented by Terrain Trail Runners!
2026 RACE DAY REGISTRATION
- Thunder Chicken 100K - ALL 3 DAYS - $275.00
- Thunder Chicken 21Mi - $130.00
- Thunder Chicken 26Mi - $155.00
- Thunder Chicken 25K - $100.00
- Thunder Chicken Pick 2 - Option 1 (21Mi & 25K) - $170.00
- Thunder Chicken Pick 2 - Option 2 (26Mi & 25K) - $200.00
- Thunder Chicken Pick 2 - Option 3 (26Mi & 21Mi) - $215.00.
*Included in your RACE DAY REGISTRATION
*Swag Subject to Availability
Custom Finisher Medal
Post-Race Snack and Beer!
Thunder Chicken 100K Stage Races are now part of the Trail Mix Fund!
In an effort to improve diversity in trail racing and remove a potential barrier for the under-served and under-represented, the Trail Mix Fund pays the race registration fee for runners who cannot afford it or aren’t sure they belong in the sport.
We also believe that there are more BIPOC & LGBTQ+ people who would like to race and would enjoy being part of the community but aren’t comfortable taking that step of signing up to race. Waiving the registration fee alone won’t solve this problem, but maybe it can help some.
Terrain Trail Runners-STL's partnership with the Trail Mix Fund began in December 2025, and we hope you'll consider donating or applying!
INTRO
Thunder Chicken 100 Stage Races St. Louis’s only three-day trail running stage race!
Hosted at Greensfelder County Park (Beulah Shelter) in western St. Louis County, Missouri, this event was created for adventure seekers who want a full weekend of challenge, community, and unforgettable trail running. Participants come together for tough races, great fellowship, and the chance to experience some of the very best trails STL has to offer!
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.
May 15, 2026 - Stage 1 - 21-ish Mi - Tour de Rockwoods Range
May 16, 2026 - Stage 2 - 26-ish Mi - Tour de Rockwoods Reservation
May 17, 2026 - Stage - 25K-ish - Tour de Greensfelder
LOCATION
Race will be hosted at the Beulah Shelter that is located off the Scenic Road Loop at Greensfelder County Park.
Please visit the parks Greensfelder County Park website for more information.
COURSE DESCRIPTION
Stage 1 - 21-ish Mi - Tour de Rockwoods Range
Stage 1 features a demanding out‑and‑back route linking the scenic trail systems of Greensfelder Park and Rockwoods Range. Beginning on the Beulah Trail, runners will traverse the Fossil Ridge and Deer Run Trails before crossing into Rockwoods Range to take on the Roundhouse, Spur, Green Rock, and Fox Run Trails.
With approximately 2,650 feet of cumulative elevation gain, this stage delivers a true test of endurance and technical skill. The terrain varies from steep grades to flowing, rolling hills, with plenty of rocks, roots, and creek crossings to keep runners alert and engaged. The combination of rugged footing and sustained climbing makes Stage 1 a challenging and rewarding introduction to the course.
Stage - 2 - 26-ish Mi - Tour de Rockwoods Reservation
Stage 2 delivers a rugged out‑and‑back challenge that covers the full length of the Beulah Trail before linking the flats to the Green Rock Trail, Rock Quarry Trail, and a brief paved stretch of the Trail Amongst Trees. From there, runners connect to the Lime Kiln Trail Loop—tackled clockwise—before retracing their steps back to the finish.
This stage is a stout trail marathon in every sense. The route blends smooth, flowing singletrack with some of the steepest, most demanding climbs in Rockwoods Reservation. Expect technical footing, abundant rocks and roots, and terrain that demands constant focus. With a cumulative elevation gain of 4,150 feet, Stage 2 earns its reputation:
This one is tough nuggets.
Stage - 3 - 25K-ish - Tour de Greensfelder
Stage 3 highlights some of the finest singletrack flow that Greensfelder County Park is known for. The route links DeClue, Dogwood, and Deer Run before crossing onto Eagle Valley and ultimately climbing the Scenic Overlook Trail back toward the Beulah Shelter. And just when you think you’re cruising home, the final climb delivers a spicy sting—340 feet of elevation gain before you can ease into the finish.
While this stage is undeniably fast, it’s far from effortless. Expect punchy technical sections, scattered rocks and roots, and terrain that keeps you sharp from start to finish. With a cumulative elevation gain of 1,850 feet, Stage 3 blends speed with grit in all the right ways.
START TIME, TIME LIMIT & CHECK IN
Stage 1: Friday, May 15, 2026 - Start Time: 7AM - Cutoff time - 8 Hours
Stage 2: Saturday, May 16, 2026 - Start Time: 7AM - Cutoff time - 9 Hours
Stage 3: Sunday, May 17, 2026 - Start Time: 7AM - Cutoff time - 6 Hours
*Please refer to the race WEBSITE for additional strictly enforced cut‑off times for each stage.
AID STATIONS
There will be a minimum of one aid station per stage race. Please review the racecourse maps on the website for more information.
SWAG, AWARDS & POST RACE
Included In Your Race Registration:
Custom Cotton/Poly Lifestyle T-shirt - Unisex Sizes
*DEADLINE FOR GUARANTEED SWAG WITH YOUR REGISTRATION IS April 19, 2026.
Online registrations received after the above deadline will receive alternative swag. Limited quantities!
Stage 1 and Stage 2 post-race easy grab snack and beer to Salute! - May 15 & 16. Stage 3/All 3 Day Stage Runners post-race Taco Bar (Veggie and Non-Veggie Option) with fixings and beer to Salute! - May 17.
All 3 Day Stage runners will receive a custom belt buckle.
Individual Stage 1, Stage 2 and Stage 3 runners will receive custom medals.
Awards will be given to overall male, female and non-binary participants for All 3 Day Stage finishers ONLY.
REFUND AND GENERAL RACE POLICIES
Race refund policy and other general policies can be reviewed HERE
*Please Review ALL Race Policies Before Signing Up for the Race*
CAMPING/LODGING
Greensfelder County State Park has tent camping, RV hook-up and showers available. For more information and to make reservation visit the parks website or call St. Louis County Parks at 314-615-4386
There's lodging around Six Flags. Other than that closest town to search for lodging would be Wildwood, Ballwin, Fenton, Chesterfield and or Ellisville.
THIS IS A CUP-FREE EVENT
PLEASE NOTE: TC100K STAGE RACES IS A CUP-FREE EVENT, which means there won't be any paper cups at aid stations, and there won't be any paper or plastic cups at our finish-lines. We won't be making any exceptions to this rule, so if you don't bring your own drinking receptacle come race-weekend, you'll want to pre-purchase a collapsible cup and if you don't already have a reusable soft flask to carry with you on the course (for soda & electrolyte drink, etc.), we will have the collapsible cups for purchase when you check in for the race and/or at packet pickup for $5 (quantities limited at check-in).
Please help us keep our races eco-friendly, minimize the trash in the landfills and our trails clean.
Together we can make a difference!!!
SUSTAINABILITY
READ ABOUT OUR SUSATINABILTY PLEDGE HERE
PLEASE NOTE: All our races are CUP-FREE and please bring your own MESS KIT with a plate and spork for post-race grub.
*We will not have any paper or plastic cups, plates and/or utensils at our events to help us reduce the waste from our races as part of our Zero Waste pledge.
Event's current local time: 7:47 AM CT
