& Mine Shaft Half

“Letting Little Balls Decide My Fate”

The Tommyknocker 12-Hour is a one-of-a-kind challenging 12-Hour timed event, designed by YOU… and tiny colorful balls. Gazing out at the spectacular views of Colorado’s Front Range above the Denver Metro Area, this race will make you laugh, and possibly cry. The course features double-track and single-track trails with ZERO pavement, and an aid station you’ll want to hang around at for hours (we’re that much fun)!

The Mine Shaft Half features a mountain of lollipop loop course, quite literally. Enjoy the aggressive elevation gain, we promise you won’t feel shafted. We guarantee we will have the best and goofiest aid station you’ve ever experienced in a half marathon.

Choose your fate at the Tommyknocker 12-hour event, and remember fate is not always on your side. Sometimes fate has a different plan in store for you. Facing the unknown, and dreading the pastel ping pong balls is part race, part carnival, and ALL fun. Time will take away the unknown and will abate the fear. You will be left with joy, pride, and confidence in your running soul. Face #Adversity, face the unknown, and come to know yourself better through it all.


Date: May 9, 2020
Distances: How ever far you can run, on multiple loops, in 12-Hours. Or enjoy our trail Half Marathon.
Start Time: 6:00 am
Elevation Gain/Loss: ??Up To Luck??
Time Limit: 12 Hours (both races!)
Location: White Ranch Open Space in Golden, CO


12 Hour – SOLO Division:

December 1 – December 3, 2019: $90.00
December 4, 2019 – January 31, 2020: $110.00
February 1, 2020 – May 5, 2020: $120.00
Race Day – $120 CASH ONLY (No Shirts, & Awards by limited availability only)

Team Captain will pay price in full
Each member runs to accumulate miles collectively.

December 1 – December 3, 2019: $180.00
December 4, 2019 – January 31, 2020: $220.00
February 1, 2020 – May 5, 2020: $240.00
Race Day – $240 CASH ONLY (No Shirts, & Awards by limited availability only)

Mine Shaft Half:

December 1 – December 3, 2019: $60.00
December 4, 2019 – January 31, 2020: $80.00
February 1, 2020 – May 5, 2020: $90.00
Race Day – $100 CASH ONLY (No Shirts, & Awards by limited availability only)

HPRS Members Enjoy a minimum of 10% Off Registration Fees!

Those registering after Monday, April 27, 2020 will not receive a race shirt, and awards only as available (limited)
Online Registration closes May 5, 2020 at 11:59pm


Support Jefferson County Open Space!
HPRS pays $5 from every race registration directly to Jefferson County Open Space.
During your registration process, you’ll have the option to donate additional funds to JeffCO OSMP
You can donate $5, $10, $20, or $50 extra dollars. Help us support JeffCO and their amazing trail network!


Course: After running from the race’s start location to the upper White Ranch Parking Lot, runners will dive their fists into a bucket full of colored balls. These colored balls will be colored Red, Green, Orange, and Yellow. The color the runner pulls will indicate which loop they will now run.

Each loop will be marked with flagging tape the same color as the ball pulled (Green Ball follows Green Markings, Red Ball follows Red Markings, etc). After completing the selected loop, their miles will be recorded, and a new ball will be selected by the runner. This repeats for nearly 12 hours.

No two runners will run the same exact course. It’s the luck of the draw and how tenacious one can be in order to run as many miles as they can in this 12-Hour Carnival. Runners are guaranteed 14.5 miles totaled on the approach to the upper lot and the return run back to the bottom at the end of the race. Runners MUST return to the bottom lot prior to the 12-hour cut-off in order for their miles to count. Late runners will receive a ZERO for the event.

Mine Shaft Half: For those who don’t want to run in circles for 12-hours, but would still like to join us for a day on the trails; The Mine Shaft Half is for you. You’ll run the same route (Purgatory) as the 12-Hour runners to the main aid station. From there you’ll run the green loop before descending Purgatory to the bottom lot. The half marathon features 3,786′ of elevation gain and 3,786′ of elevation loss.

Team Division: Teams will be made up of just two individuals. Both members of your team will run the event just as the solo runners will, except your miles will come together collectively to create a grand total for your team. All teams face off head to head with the winning team being the one with the most collective miles. This provides an opportunity for those of you who can’t run for all 12-hours, to have a teammate who can. 

Aid Stations: There will be one main aid station set up for the event. This aid station will be located in the Upper Parking Lot to White Ranch Open Space. Runners will check in and out of this aid station at the beginning and end of each loop. The aid station will be fully stocked with water, electrolyte drink, and assorted “Ultra” snacks. It will also have drop bag access.

CREWS AND PACERS: Due to very limited parking in the area, and the number of runners in the event, we cannot accommodate crews and/or pacers. There is simply no availability for parking crews, pacers, or spectators. Please help us out by having non-participants remain away from the event. 

Parking: All runners must park at the designated parking locations ONLY. We ask that you NOT park at White Ranch Open Space. CARPOOL! We need to leave the parking lots open to other trail users. PLEASE ONLY PARK IN DESIGNATED AREAS. A map of these areas will be available closer to the race. With that in mind, we do operate a volunteer based shuttle program to and from the race. 

Pre-Race Check in: Packet and bib number Pick-Up will take place from 4:30-5:45am in the lower lot of White Ranch. All runners must check-in with race staff the morning of the run by 5:45AM. Runners not checked in by 5:45 AM will not be scored as official runners of the event.

Pre-Race Briefing: Saturday Morning at 5:45am at in the White Ranch Lower Lot.

Post-Race Celebration: There will be a post race gathering TBA.

Awards: All official finishers will receive a unique finishers award. We’ll also present special awards to Most Adversity, Best Blood and a few surprise awards as well.


Permits: This event is being held in accordance with permits from Jefferson County Open Space and Mountain Parks. We ask that you please respect and care for the land this event is held on to help ensure the future of this race and to limit our environmental impact.