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Crescent Moon Triathlon at the Aurora Reservoir
Summer 2017

Sprint: 750 Meter Swim - 20K Bike - 5K Run
Olympic: 1,500 Meter Swim - 40K Bike - 10K Run

Arapahoe County is no longer allowing bicycle events to take place on East Quincy, effectively ending the era of triathlons at the Aurora Reservoir. It's a bummer - we have been organizing triathlons at the Aurora Reservoir since the summer of 2,000!

We presented a plan to the reservoir 4 months ago to hold the event entirely within the park, but it was shot down by homeland security regulations in October because it passed too close to the water treatment facility

We immediately submitted plans to bring the race to a new venue, and it looked very promising, however it fell through just this week. Unfortunately, at this late date we will not be able to produce the Crescent Moon Triathlon in 2016. Many of you are already planning your season, and we had set January 1st as the deadline to open registration.

We are already putting together a plan to bring you a bigger and better Crescent Moon Tri in 2017. We will keep you posted!!!

In the meantime, I hope we will see you at the Barkin' Dog Duathlon, the Evergreen Sprint Triathlon, The Littlefoot Triathlon, or our Desert's Edge Triathlon Festival.

Thanks for your support,
Darrin, Jill, and the Racing Underground Crew



Contact Us

2014 Results & Photos

2014 Results
2014 Photos

Past Results

Triathlon FAQ's

Race Rules


The Crescent Moon Sprint & Olympic Triathlons take place at the beautiful Aurora Reservoir! This means crystal clear water for the swim, a fun 20k or 40k bike course that is closed to auto traffic for 90 percent of the ride, a run that is also traffic-free, and a fantastic post-race pancake breakfast & expo area - all with convenient parking! The 9th annual Crescent Moon Sprint Triathlon promises to be bigger and better than ever! Join us at the Aurora Reservoir, and experience the Racing Underground difference!

Entry Information

Entry Fees:
Registration will open in mid-December

Register Online

Register by Mail

Your Race Entry Fee Includes:

  • Free Hi-Res Photo Downloads
  • A high quality race tech shirt
  • Awesome post-race food
  • Finisher Medal for all finishers
  • Racer Goody Bag
  • Swim Cap
  • Free Park Entry, Music, and fun!
  • Great Raffle, with merchandise & gift certificates from our amazing sponsors!

Every effort will be made to hold the race, 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 issued 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 to another athlete for a $10 fee until 10 days before the event. No transfers will be allowed fewer than 10 days before the event. No refunds or credits will be issued if the race is shortened, postponed, or cancelled due to weather.

Race Course

The Crescent Moon Triathlon offers the choice of sprint or Olympic distances.

SWIM (Map): Sprint distance swimmers will complete a 750 Meter rectangle-shaped swim in crystal clear Aurora Reservoir, starting and finishing on the sandy beach adjacent to the swim area. Olympic swimmers will swim an extended version of the sprint course. The start will be in waves which will be posted at packet pick-up and on our website 1 week before the event. Water temperature in the reservoir in June is typically in the mid-sixties, so wetsuits are encouraged.

BIKE (NEW MAP): Due to new regulations imposed by Arapahoe County, we have revised the Olympic bike course in 2015. The Olympic bike course will now be two laps of the sprint course. This will make the course more exciting, as Olympic athletes will now pass by cheering spectators at the halfway point in the ride! We will also record and post half-way splits for the Olympic bike course! The Crescent Moon bike course is a rolling 20k out and back route. The course will be closed to traffic for about 90 percent of the route. Drafting is not allowed on the bike course, and motorcycle marshals will be enforcing this rule.

RUN (Map): The sprint run course is a beautiful loop course on a mix of bike path and well-maintained non-technical dirt running trail. The course is measured at 3.25 miles (just a bit over 5k) which allows us to avoid the standard out-and-back run on the bike path that most races use. The 10K Olympic course is a measured and accurate 6.2 miles which covers the same scenic loop as the sprint, with a bonus 3 mile segment that splits from the sprint loop at approximately 1.5 miles, and rejoins the sprint loop for the final 1.5 miles.

Aid Stations There will be two aid stations on the 5K run course, and five aid stations on the 10K course. All aid stations will be serving ice cold water and Gatorade Endurance. There will also be gel at the turnaround on the 10k run course.

TRANSITION (Map): The transition area will be located in the upper parking lot at the Aurora Reservoir, just above the finish line and expo area.

Relay Teams will receive 1 timing chip which must be transferred from swimmer to biker to runner. This exchange will take place at a designated are within the transition near the bike-in/bike-out location. Timing chips are attached to a soft, comfortable Velcro strap which must be worn on the ankle.


For more information on the Crescent Moon Triathlon, call Darrin or Jill at 303-642-7917, or email


Volunteers are always appreciated, and we will use more than 60 of them on race day!!!. Volunteers will receive a race tech-shirt, post race food, and a free entry into the Racing Underground event of their choice. If you are interested in volunteering, please call us at 303-642-7917.


Participants will start in waves of fewer than 100 participants beginning at 7:30am. Waves are assigned by age group or division, with a final sprint wave reserved for beginners (athletes starting in the beginner wave will not be eligible for age group awards). Your age is based on your age on December 31, 2015. All participants will receive a color coded swim cap. You must wear your official Crescent Moon Swim Cap, and start in the wave designated by your swim cap color. Swim wave assignments are listed in the race schedule below.

Race Day Schedule
(All Events at the Aurora Reservoir)

  • 5:30 a.m. - Transition Opens
  • 5:30 a.m. - Race-Day Packet Pickup Opens
  • 5:30 a.m. - Body Marking
  • 7:10 a.m. - Race-Day Packet Pickup Closes
  • 7:25 a.m. - All Triathletes must be out of transition
  • 7:25 a.m. - Pre-Race Briefing at Swim Start
  • 7:30 a.m. - First Wave of Swim Starts
  • 9:00 a.m. - Food & Drinks Open
  • 10:30 a.m. - *Sprint Awards Presentation & Random Drawing
  • 11:00 a.m. - *Olympic Awards Presentation & Random Drawing

*Awards time may be adjusted depending on the number of athletes on course

Triathlon Awards

AWARDS: Awards are scheduled to be presented at 10:30 a.m. however this time may be adjusted depending the number of participants still on course.

Cash Awards in the amount of $250, $150, and $100 will be presented to the top-3 overall male and female finishers in the Olympic distance tri. Merchandise Awards will be presented to the top-3 male and female overall finishers in the sprint tri. Overall award winners will be excluded from age group awards.

In addition, awards will be presented in both the Olympic and sprint events, to the top-3 male and female finishers age 19 & under, and in each 5-year age group starting with 20-24. First place overall in each of these divisions will take home a gift certificate from Excel Sports (Olympic) or Runners Roost (Sprint).

CLYDESDALE/ATHENA:Men weighing over 220 pounds and women who weigh 165 pounds or more may choose to enter the Clydesdale or Athena divisions in place of their age group. Awards will be presented to the top-3 Clydesdale and Athena finishers. First place overall in each of these divisions will take home a gift certificate from Excel Sports (Olympic) or Runners Roost (Sprint). Clydesdale and Athena finishers will not be eligible for age-group awards.

RELAY TEAMS: The first place relay teams in Male, Female, and Coed divisions will receive awards in the triathlon. A Triathlon team consists of 2 or 3 participants.

You must be present to claim your award, or have another participant pick it up for you. Awards will be mailed upon request for 2 weeks following the event. A $10 fee to cover postage will be required before your award is mailed.

Results & Photos


The race site is the Aurora Reservoir, located a short drive from Denver. Spectators will be charged a $10.00 per vehicle entrance fee to the park. This fee will be waived for athletes on race day.

Non-Toll Road Directions: From I-70 or I-25 in Denver, exit onto I-225. Exit I-225 at 6th Avenue and turn east onto 6th Avenue. 6th Avenue eventually becomes Gun Club Rd. Stay on this road as it continues past Buckley AFB. Several miles later you will see signs for Quincy Ave and the Aurora Reservoir. Turn left on Quincy drive 2 miles, then turn right into the reservoir. If you are using MapQuest, the address is 5800 S. Powhaton Rd. Aurora, CO 80016

Packet Pick-Up

We will offer two Packet Pick-up options in 2015. You may pick up your race numbers, goody bag, and race shirt at either location. Per USA Triathlon rules, you must pick up your own packet and show a valid photo ID in order to pick up your packet. If you are an annual member of USAT, you must also show a valid USAT membership card. Participants who are not annual members of USA Triathlon purchased a $12 one-day license during registration and will not need to show a USAT card.

Early Packet Pickup: Early packet pickup will take place at the Runners Roost location in Aurora from noon until 6:30pm on Friday June 5th. Runners Roost is located at 6554 S. Parker Rd., #107, Aurora, CO 80016

Race Day Packet Pickup: We will also offer, race morning packet pickup immediately adjacent to transition. Packet Pick-up will run from 5:30 - 7:30am. If you have not picked up your packet by 7:30, you will not be able to race. There will be absolutely no race day registration for the Crescent Moon.