September 27 - 29, 2024

Hell Creek 100

switchgrass mountain bike trails

Sylvan Grove, KS Pure Hell 140, 100 Miler, 100K, 20 Miler

Registration closes: Tue, Sep 17 @ 11:59PM CT


THE HELL CREEK 100, 100k, 20, and THE PURE HELL 140
Presented by Ultraverse Supplements

A previous 100-mile finish is required to sign-up for THE PURE HELL 140 (any 100-mile race will do). If you have completed a 100 on Ultrasignup feel free to just sign-up. If you have completed a 100 miler (that you can prove) that was not listed on Ultrasignup please reach out to us before sign-up to learn what steps to take.

Starting Dates
THE PURE HELL 140 – Friday, September 27, 2024
THE HELL CREEK 100, 100k, and 20 miler – Saturday, September 28, 2024

Start times
PURE HELL 140 – 10:00 AM Friday
100 miler – 6:00 AM Saturday
100k – 7:00 AM Saturday
20 miler – 8:00 AM Saturday

THE PURE HELL 140 – Friday 9:15 – 9:50 AM (just before race start)
THE HELL CREEK 100, 100k, and 20 miler – Early Check-in - Friday before the race at the start/finish from 5:00 – 8:00 PM. Same day check-in - 100 milers – 5:00 – 5:50 AM 100k – 6:15 - 6:50 AM, 20 miler – 7:15-7:50 AM

Location – The start and finish will be located at the Switchgrass trail head (Hell Creek area) which is located near the Switchgrass Restroom parking lot.
GPS: N38°54.965 W98°30.549

Giving Back – We LOVE the Switchgrass trails! A percentage of everyone’s entry fees will be donated back to Switchgrass for trail maintenance/improvement as a token of our appreciation.

For additional race information, see our website race page at

There will be a live feed at Hell Hill and live tracking on our website.


All runs will take place on the Switchgrass Mountain Bike Trail at Wilson State Park. The 100 has the most elevation gain and loss of any 100-miler in Kansas! If you’re looking for a challenging course in the “flatlands” you’ve found it. The trail is easy-to-follow, rugged, single-track with very few trees/wooded areas. Beautiful views of Wilson State Park and Wilson Lake are abundant.

Elevation Statistics
20-mile – 2,024 ft, 100k – 6,072 ft, 100-mile - 10,120 ft, Pure Hell 140 – 14,168 ft

The races will consist of 20-mile loops – one loop for 20-milers, three loops for 100k runners, 5 loops for 100-milers, and 7 loops for Pure Hell 140-milers.

The course will be heavily marked with ribbons, flags, and wrong-way signs. This is an extremely easy course to follow. Getting off course has not been an issue.

Aid Stations – There will be two aid stations – the start/finish and “Hell Hill.” Hell Hill you will have the pleasure of visiting twice per loop. The main aid station will be at the start/finish area and Hell Hill is around 10.5 miles and 16.75 miles of the loop. Both will include your typical aid station items – food (vegan options), water, soda, and electrolyte drink. Both aid stations will have some hot food items at night as well. There will be 1 unmanned water station at mile 5. The furthest one must go without access to water is 6.25 miles.


20 milers – Shirt with race logo/sponsors and a draw string bag. Finishers will receive a distance specific medal and a beer.

100k – Shirt with race logo/sponsors, drawstring bag, and stainless steel tumbler.  Finishers will receive a distance-specific 100k buckle and a beer.

100 milers – Shirt with race logo/sponsors, a Hell Creek 100 mile bomber jacket, and drawstring bag.  Finishers will receive a distance-specific 100-mile buckle and a beer.  Sub-24 hour finishers will receive a sub-24 buckle in place of the traditional 100-mile buckle. 

PURE HELL 140 milers – 140 milers – Pure Hell 140 shirt, bib belt, bomber jacket, drawstring bag, and Pure Hell 140 finisher’s buckle. Finishers will also receive a customized Pure Hell 140 puffy vest with their name embroidered on it and a beer.

*Additional small freebie items will be included in swag bags

**Correct shirt sizes are not guaranteed for entries within 3 weeks of the race. Additional merchandise can be purchased at the ultrasignup store.

NEW FOR 2023 – FUR-BABY AWARDS! If your pup runs with you, we will give him/her a pup-specific Hell Creek medal that can be worn on a leash/harness!

1st, 2nd, and 3rd place male and female in each distance will receive special awards.


20-mile – 6:00 PM Saturday (10 hours)
100k – 7:00 AM Sunday (24 hours)
100-mile - 2:00 PM on Sunday (32 hours)
PURE HELL 140 – 2:00 PM Sunday (52 hours)
100-mile AND Pure Hell 140 runners MUST have STARTED their last (5th or 7th) loop by 9:00 AM on Sunday
Drop Bags- Drop bags are allowed at both manned aid stations.

Pacers are allowed on THE PURE HELL 140 and Hell Creek 100 miler ONLY. Pacers are allowed after 3 laps, approximately 100k. No muling (carrying ANYTHING for your runner). Pacers can start only at MANNED aid stations. Pacers are not allowed to grab something at an aid station and take it to their runner ON COURSE. Runners must carry 100% of their food, drink, and gear. If they want something from the aid station, they MUST make the trip to the aid station. There are no exceptions to this rule, and breaking it will result in disqualification.

Crew is only allowed at the two MANNED aid stations. Crew may not assist runners anywhere except for the two manned aid stations. Any assistance outside of the main aid station will result in disqualification – no warnings, no exceptions

Runners MUST CROSS the finish line every loop before heading to their crew areas.

No special start/finish times – you must start with YOUR race!

Beer and aid station food is for volunteers and runners only.

This is a state park, and you will need a Kansas State Park day pass or an annual pass. If you don't have one, you may or may not be fined. Please don’t ask us if you need one. It’s your call. You can purchase one on the way into the park.

Minimum age of 18 years old to race.

You are allowed to change to a different distance. This can be done (by you) on Ultrasignup by editing your registration. If you change to a cheaper distance, you will not be refunded for the difference. If you change to a more expensive distance, you will be directed to the cart, where you will pay the difference.

If you cannot attend please let us know at least three days prior to race start and we will take your name off of the entrants list. If you do not tell us at least three days before race start you will be listed as DNS on the results.

We DO NOT allow runners to drop distances after starting the race. If you start the 100 miler, you either complete it, or you DNF. Same goes for 100k participants in regards to dropping to the 20 mile. THE RACE YOU START IS THE RACE YOU MUST FINISH. NO EXCEPTIONS.

If you litter, you will be disqualified.

If you cut the trail, you will be disqualified.

You must carry a means to hold water at all times.

No whining or complaining. ;). It’s supposed to be hard. It might be hot, it might be cold, and the wind might blow. If you’re prepared you’ll be OK.

Race Cancellation – In the event the race is cancelled due to severe weather, or other uncontrollable circumstances we cannot offer refunds. Everything is typically already paid for at this point. That being said, it is highly unlikely, and we will do everything in our power to make sure the race happens.



Please join our FB group for the most up-to-date info -

Proxima C Endurance Fuel will be our sole carbohydrate and electrolyte beverage. It is the best ultra-fuel there is! If you haven’t tried it, get some here -

Sofa King Awesome Slam

We have teamed up with Elden Galano and Kansas Ultrarunners' Society to bring you the Sofa King Awesome Double! Sign up for one of the Hell Creek races AND a Heartland race (the weekend after Hell Creek) and earn an extra buckle for completing them both. Which buckle you earn depends on the distances signed up for. Check out the Heartland series here - It's going to be Sofa King Awesome!

Deferral & Withdrawal


100% credit if canceled prior to 45 days of the race.
75% credit if canceled prior to 30 days of the race.
50% credit if canceled prior to14 days of the race.

no credit is given for cancellations less than 2 weeks prior to the race. You’ll still be listed as DNS if notification is not given prior to 3 days before the race starts.

Please understand that there are no exceptions to these timelines. Please, don’t ask us to make one (we won’t).

•Races should deferred/withdrawn from BY THE RUNNER, rather than by messaging/emailing us.

• You will earn credit for ANY Ultraverse Supplements race, rather than being limited to the race in which you cancelled/deferred.

• The credit will be attached to your Ultrasignup account and will automatically apply the next time you register for an Ultraverse Supplements event. Note - sending an email to us does not initiate the cancellation of your registration. You must do this yourself for the credit to apply. You can do this by signing into Ultrasignup and then going to your registrations and clicking “edit”.

• Your credit appears in your registration history under "outstanding credits and coupons".

• Credit will be valid for one year, cannot be “gifted” to another runner, and you must use the same Ultrasignup account in which you originally registered for the race that you withdrew from.

You can see all Ultraverse Supplements races at

Event's current local time: 5:18 PM CT


Linked Events

Start Times

Ask a Question

Top Performances