Thunder chicken 100K stage races
May 15-17, 2026
Greensfelder County Park/Beulah Shelter
4515 Hencken Road
Wildwood, MO 63069
May 15-17, 2026
Greensfelder County Park/Beulah Shelter
4515 Hencken Road
Wildwood, MO 63069
REGISTRATION INFORMATION
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Race Day Registration
Thunder Chicken 100K - ALL 3 DAYS - $275.00 *CASH ONLY* Race day/onsite registration for all 3-Stages or individual stage events will begin at 6AM on Friday, May 15, 2026! *Included in your ALL 3 DAYS - RACE DAY REGISTRATION *Swag Subject to Availability Custom Finisher Buckle Post-Race Grub and Beer! Check In and Packet Pickup: 6AM - 6:45AM at Beulah Shelter *Check individual event start time, time limit, race day registration and check-in information for Stage 1, Stage 2 and Stage 3 |
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Race Day Registration
Thunder Chicken 21-ish Mi - $130 *CASH ONLY* Race day/onsite registration for Stage 1 will begin at 6AM on Friday, May 15, 2026! *Included in your RACE DAY REGISTRATION *Swag Subject to Availability Custom Finisher Medal Post-Race Snack and Beer! START TIME, TIME LIMIT & CHECK IN Friday, May 15, 2026 Start Time: 7AM Cutoff time - 8 Hours Other strictly enforced cut‑off times include: Aid Station Cutoff - 4 Hours All Stage 1 runners must be checked OUT of the aid station at Fox Creek Aid Station - 10.7Mi prior to 11:00 AM on their way back to the start/finish. Please note: Runners who do not meet the listed aid‑station cut‑off time will not be permitted to continue on the course. |
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 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.
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Race Day Registration
Thunder Chicken 26-ish Mi - $155 *CASH ONLY* Race day/onsite registration for Stage 2 will begin at 6AM on Saturday, May 16, 2026! *Included in your RACE DAY REGISTRATION *Swag Subject to Availability Custom Finisher Medal Post-Race Snack and Beer! START TIME, TIME LIMIT & CHECK IN Saturday, May 16, 2026 Start Time: 7AM Cutoff time - 9 Hours Other strictly enforced cut‑off times include: Aid Station Cutoff - 6.5 Hours All Stage 2 runners must be checked OUT of the aid station at Rockwoods Reservation Aid Station - 17.8Mi prior to 1:30 PM on their way back to the start/finish. Please note: Runners who do not meet the listed aid‑station cut‑off time will not be permitted to continue on 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 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.
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Race Day Registration
Thunder Chicken 25K-ish Mi - $100 *CASH ONLY* Race day/onsite registration for Stage 3 will begin at 6AM on Sunday, May 17, 2026! *Included in your RACE DAY REGISTRATION *Swag Subject to Availability Custom Finisher Medal Post-Race Snack and Beer! START TIME, TIME LIMIT & CHECK IN Sunday, May 17, 2026 Start Time: 7AM Cutoff time - 6 Hours Other strictly enforced cut‑off times include: Aid Station Cutoff - 4 Hours All Stage 3 runners must be checked OUT of the aid station at Roundhouse Aid Station - 9.1Mi prior to 11:00 AM on their way back to the start/finish. Please note: Runners who do not meet the listed aid‑station cut‑off time will not be permitted to continue on the course. |
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.
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.
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Race Day Registration
Thunder Chicken PICK TWO *CASH ONLY* Race day/onsite registration for ALL Pick Two Stages will begin at 6AM on Friday, May 15, 2026! Pick 2 - Option 1 (21Mi & 25K) - $170.00 Stage 1 & Stage 3 Pick 2 - Option 2 (26Mi & 25K) - $200.00 Stage 2 & Stage 3 Pick 2 - Option 3 (26Mi & 21Mi) - $215.00 Stage 1 & Stage 2 *Included in your RACE DAY REGISTRATION *Swag Subject to Availability Custom Finisher Medal Post-Race Snack and Beer! *Check individual event start time, time limit, race day registration and check-in information for Stage 1, Stage 2 and Stage 3 |
For more information on Terrain Trail Runners -STL general race polices and withdrawal/refund policies. Please see the FAQs page.
All other race‑specific information will be emailed after May 10, 2026, once online registration closes on UltraSignup.
All other race‑specific information will be emailed after May 10, 2026, once online registration closes on UltraSignup.
General Thunder Chicken 100K stage race specific information:
AID STATIONS
Stage 1 - Aid Station will be at 10.7 Miles. This will be a fully supported aid station!
Water Drop at 5.3 Miles outbound and 16.0 Miles inbound
Stage 2 - Aid Station will be at 8.6 Miles outbound and 17.8 Miles inbound (runners will be utilizing this same aid station both outbound and inbound). This will be a fully supported aid station!
Water Drop at 5.7 Miles outbound and 20.7 Miles inbound.
Stage 3 - Aid Station will be at 9.1 Miles. This will be a fully supported aid station!
Water Drop at 5.6 Miles and 13.1 Miles inbound.
*Review each stage maps for aid station details
SWAG, AWARDS & POST RACE
*Opt-Out of Swag and Plant a Tree!
READ MORE HERE
Included In Your Online 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
*As part of our Zero-Waste racing pledge to help reduce our environmental footprint because we believe every little action matters, we will no longer have paper plates and/or plasticware for post-race food. Runners and their crew are encouraged to PLEASE bring their own (non-disposable) plate and utensils to help reduce the trash from our events.
Please help us keep our races eco-friendly, minimize the trash in the landfills and our trails clean. Together we can make a difference!
You can read more about our Sustainability Pledge here: SUSTAINABILITY - Terrain Trail Runners
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.
TRAVEL/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.
SAFE TRAVEL!
AID STATIONS
Stage 1 - Aid Station will be at 10.7 Miles. This will be a fully supported aid station!
Water Drop at 5.3 Miles outbound and 16.0 Miles inbound
Stage 2 - Aid Station will be at 8.6 Miles outbound and 17.8 Miles inbound (runners will be utilizing this same aid station both outbound and inbound). This will be a fully supported aid station!
Water Drop at 5.7 Miles outbound and 20.7 Miles inbound.
Stage 3 - Aid Station will be at 9.1 Miles. This will be a fully supported aid station!
Water Drop at 5.6 Miles and 13.1 Miles inbound.
*Review each stage maps for aid station details
SWAG, AWARDS & POST RACE
*Opt-Out of Swag and Plant a Tree!
READ MORE HERE
Included In Your Online 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
*As part of our Zero-Waste racing pledge to help reduce our environmental footprint because we believe every little action matters, we will no longer have paper plates and/or plasticware for post-race food. Runners and their crew are encouraged to PLEASE bring their own (non-disposable) plate and utensils to help reduce the trash from our events.
Please help us keep our races eco-friendly, minimize the trash in the landfills and our trails clean. Together we can make a difference!
You can read more about our Sustainability Pledge here: SUSTAINABILITY - Terrain Trail Runners
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.
TRAVEL/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.
SAFE TRAVEL!
