Denver's Best Spring Half! The Three Creeks Half Marathon
Sunday April 22, 2018 at Cherry Creek State Park in Denver

Course Info
Description & Map

Limited to 750 Runners

Results & Photos
Finisher Certificates & Video

Race Info
Schedule, Parking, Packets

Contact Us
Questions & Volunteering

Welcome to Denver's Best Spring Half Marathon!

Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a USA Track & Field certified half marathon course that is flat, fast and scenic!

Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total combined elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek on a mix of road, paved running trail, and wide dirt trails.

We hope to see you at the second annual Three Creeks Half this April!

Darrin, Jill,and the Racing Underground Crew

General Race Information


  • 6:30am - Packet Pickup & Race Day Registration Opens
  • 7:30am - Optional Early Start for runners planning to take more
    than 2 hours 30 minutes to complete the course
  • 8:00am - Official Start Time
  • 9:00am - Pancake Breakfast Opens*
  • 10:30am - Awards Presentation*
  • 11:45am - Finish Line Closes (4:15 from early start)

* Awards time may be adjusted depending on the number of runners on course. Pancake breakfast is included with registration for runners. Spectators may purchase a meal ticket for $5 (cash only) on race morning.

Location: Hobie Hill group area, near the Cherry Creek Marina. Free runner parking will be available at Cherry Creek High School, just a short walk from the start/finish line and expo area.

Directions: From I-25, take exit 199 (Belleview). Turn east at the end of the exit ramp and drive approximately 1 mile east on Belleview to Yosemite (there will be a stop light). Turn left on Yosemite and drive approximately 0.5 miles to Campus Drive (on your right). Parking staff will direct you to parking in the Cherry Creek High School SOUTH parking lot. Please do not park in any other lots, as all other school lots have been reserved for events at the high school on race day. Also, there will be no race parking inside the park. Once parked, you will walk into the park. You will see the start/finish area at Hobie Hill on your left approximately a quarter mile past the entrance station. The walk from parking to the stert/finish area will take about 15 minutes. Please plan accordingly so you do not miss your start. We will have a bag check area at the start line, so you do not have to walk back to your car.

Packet Pickup: We will have early packet pickup and race day packet pickup options in 2018.

Awards: Cash Awards in the amount of $250, $150, and $100 will be presented to the top-3 overall male and female finishers. Top-3 overall will be determined by the gun time of the 8:00am wave. Age Group awards for ages 19 & under, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75-79, and 80+ will be awarded by net (aka chip) time. Gift certificates from Runners Roost will be presented the first place age group award winners!

Start Procedure & Cutoff Times: Racing Underground utilizes a 2-wave start procedure for its half marathon distance events - the 'Official' start time, and an optional 'Early' start time for athletes who will take more than 2 hours and 30 minutes to complete the course.

The Official start time for the Three Creeks Half Marathon is 8:00am. The optional Early Start time is 7:30am. All runners and walkers must complete the course by 11:45am. This means early starters have 4:15 to complete the course, and 8am starters have 3:45 to finish. All finishers, regardless of wave, will be listed in the official results and will receive a finisher medal.

Why do we do this? There are two reasons why we use this two wave start procedure. First, the early start allows our slower runners to enjoy a better finish line experience, with more spectators on hand to cheer them in. The second reason is for course logistics.

There are no requirements to enter the 8am start, except that you must finish faster than 3 hours 45 minutes. If you are a 3 hour half marathon runner and you would like to start in the 8am wave, then you are welcome to start in the 8am wave.

The 7:30 Early Start requires that you MUST take longer than 2 hours 30 minutes to complete the course. If there is a chance you will run faster than 2:30, then you should start in the 8:00am wave. Early starters who run faster than 2:30 will not appear in the race results.

Registration & Entry Fees

Your entry into the Three Creeks Half includes a spot on the start line of Denver's most scenic spring half marathon, fast and accurate chip timing with split times at the 5k, 10k, and 10 mile marks. Results will be posted live to the web, with athlete tracking for your fans! Printable finisher certificates & personal finish line videos (weather permitting) will be available shortly after the event, along with FREE downloads of your race photos. You will also earn a beautiful finisher medal and a quality half-zip long sleeve tech shirt (shirts not guaranteed for entries received after April 10th), as well as a tasty post-race meal!!! Join us on the start line on April 22nd!

Registration Opens on
Friday November 24th!

Click button to register online

Click button to register by mail

Entry Fees: Nov. 24 - Nov. 30 $55 / Dec. 1 - Jan. 31 $60 / Feb. 1 - Feb. 28 $65 / March 1 - April 10 $70 / April 11 - April 22 (noon) $75.

Race Day Registration: $80 if space available

Races will be held, regardless of weather conditions, however we reserve the right to alter or shorten the course in the case of extreme weather. Once accepted, entry fees will not be refunded for any reason. You may cancel your entry and receive a 75 percent credit toward any other Racing Underground event until 30 days before race day or until the race sells out, whichever comes first. The credit will be valid for 12 months. You may transfer your entry to another runner for a $10 fee until 10 days before the event. No transfers will be allowed fewer than 10 days before the event. No refunds will be issued if the race is shortened, postponed, or cancelled due to weather.

Course Description

The Three Creeks Half Marathon covers a USA Track & Field certified 13.1 miles within Denver's Cherry Creek State Park. The course covers a mix of wide and smooth dirt running trails, winding paved running paths, and a few miles of paved roads.

The course is as flat as it is scenic, with a total elevation gain of just 291 feet spread out over the 13.1 mile course. You will follow the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek, with aid stations approximately every 1.5 to two miles, for a total of 8 opportunities to rehydrate - perfect for an early spring run!

Aid Stations will offer both Water and Gatorade Endurance. Gels will be available at the 6.5 and 10 mile aid stations.

Toilets will be available at the start/finish and on course at (approximately) miles 1, 2, 8.5, and 10.5

Split times will be recorded at the 5k, 10k, and 10 mile marks on the course.

Click Here to view the course map USATF certification is currently pending

Contact Us

Most questions are answered right here on the race website. If you can't find the answer here, please feel free to email or call us!

Email: to info@racingunderground.com

Phone: 303.642.7917 (this is a home phone - Call between 8am and 8pm only, please!)

Volunteering: If you would like to volunteer for a race, we would love to talk with you! Just send an email to info@racingunderground.com and we'll get right back with you.

Other Great Events: Check out our website at www.RacingUnderground.com to learn about our other exciting running and multisport events!


Registration Opens on
Friday November 24th!

- 2018 Race Results -

- 2018 Race Photos -

- 2017 Race Results -

- 2017 Race Photos -

- 2016 Race Results -

- 2016 Race Photos -

- 2015 Race Results -

- 2015 Race Photos -