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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2016-2017


Chilly Cheeks Winter Duathlon Series
Winter 2016-2017


Superior Stocking Run
Dec. 11, 2016


Yeti Chase 5K/10K
Jan. 22, 2017


Ralston Creek Half Marathon & 5K
Feb. 5, 2017


Three Creeks Half Marathon
April 23, 2017

Barkin' Dog Duathlon
May 7, 2017


Mt. Evans Ascent
June 18, 2017


Evergreen Sprint Triathlon
July 23, 2017


Desert's Edge Tri Festival
Sept. 2017


XTERRA Fruita
Sept. 2017


Desert's Edge Sprint Tri
Sept. 2017


Desert's Edge Olympic Tri
Sept. 2017


Littlefoot Triathlon
Sept. 16, 2017


Winter Running Series
Winter 2016-2017


Chilly Cheeks Winter Duathlon Series
Winter 2016-2017


Superior Stocking Run
Dec. 11, 2016


Yeti Chase 5K/10K
Jan. 22, 2017


October 2016

  • 15 - Splashland Triathlon - (5k Run/10M Bike/400yd Swim) - Splashland - Alamosa, Colorado - 9:00 a.m.- 719.298.0662
  • 16 Back at the Ranch Duathlon (5m MTB/5m Run/5m MTB or 10m MTB/10m Run/10m MTB), Wolcott, Colorado, 8:00 a.m., 970.445.7076

December 2016

Racing Underground December Events

Date Event Location Website
17 Chilly Cheeks Winter Duathlon Series #1 Cherry Creek State Park - Aurora, CO Website

Details: A fun low-key, low-cost winter run & bike series. Each month features a different format, with a total run distance of 4 miles and bike of approximately 10 miles. Each race draws 200-400 participants!

Other area December Events


January 2017

Racing Underground January Events

Date Event Location Website
14 Chilly Cheeks Winter Duathlon Series #2 Cherry Creek State Park - Aurora, CO Website

Details: A fun low-key, low-cost winter run & bike series. Each month features a different format, with a total run distance of 4 miles and bike of approximately 10 miles. Each race draws 200-400 participants!

Other area January Events


February 2017

Racing Underground February Events

Date Event Location Website
25 Chilly Cheeks Winter Duathlon Series #3 Cherry Creek State Park - Aurora, CO Website

Details: A fun low-key, low-cost winter run & bike series. Each month features a different format, with a total run distance of 4 miles and bike of approximately 10 miles. Each race draws 200-400 participants!

Other area February Events

  • 18 Mt. Taylor Winter Quadrathlon, (12M Bike/5M Run/2M Ski/2M Snowshoe/4M Ski/5M Run/13M Bike), Grants, New Mexico, 800.748.2142
  • 25 - Chilly Cheeks Winter Duathlon #3 - (10.8M Bike/4M Run) - Cherry Creek State Park - Denver, Colorado - 10:00 a.m. - 303.642.7917

March 2017

  • 4 Steamboat Pentathlon, Downhill Ski/SS/XC Ski/Bike/Run, Steamboat Springs, Colorado, 970.879.4300

April 2017


May 2017

Racing Underground May Events

Date Event Location Website
7 19th Annual Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 19 years, the Barkin' Dog Duathlon has served as the unofficial opening race to Colorado's multisport season! Consistently one of the largest duathlons in the western US, the race sells out every year. The Barkin' Dog offers something for everyone, with a $1,000 prize purse for the elites, gender-specific tech shirts, a catered post-race meal, awesome sponsor drawing and more. Choose from the standard 5K run, 30K bike, 5k run or the shorter 2K run, 15K bike, 5K run. Beginners are always welcome, and more than 1,000 first timers have made their debut in the Barkin' Dog Duathlon!

Other area May Events


June 2017

  • 3 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 3 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 4 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406
  • 17 - Lookout Mountain Triathlon - (500m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 25 - Tri on the Plains - (750m Swim/14M Bike/5k Run) - North Sterling Reservoir - Sterling, Colorado - 7:30 a.m.- 970.580.1166

July 2017

Racing Underground July Events

Date Event Location Website
23 Evergreen Sprint Triathlon Evergreen Lakehouse in Evergreen, CO Website

Details: Triathlon returned to Evergreen in 2012, to the rave reviews of participants! Evergreen Lake is a spectacular venue, and this 750 meer swim, 12 mile bike, 5K run course features world class scenery and a great foothills course just 25 minutes from Denver. Come see why this race has gotten bigger every year!!!

Other area July Events

  • 23 - Evergreen Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917

August 2017

Racing Underground August Events

Date Event Location Website
TBA My Way or the Tri Way TBA Website

Details: After losing our venue in 2016, My Way or the Tri Way returns in 2017 with an exciting new venue!!! The only race where you choose the order you swim, bike, and run. DonŐt like one of the sports - no problem - just skip the one you like the least! This race has sold out 8 years in a row, and we expect to sell out again in 2017. Details coming soon!!!

Other area August Events

  • TBA - My Way or the Tri Way - (750m Swim/12M Bike/5k Run in any order!!!) - New location to be announced shortly - 303.642.7917

September 2017

Racing Underground September Events

Date Event Location Website
TBA XTERRA Fruita Triathlon Highline Lake State Park - Fruita, CO Website

Details: The Desert's Edge Triathlon Festival has become THE fall road trip for triathletes from around the Rocky Mountain Region! And athletes RAVED about our new warmer mid-September date in 2014! We anticipate a sold-out event in 2015!!! Camp right at the race site, and race one of the best off-road courses of the year! A fun mix of single-track and double track, suitable for all ability levels.


TBA Desert's Edge Sprint & Olympic Tri Highline Lake State Park - Fruita, CO Website

Details: The Desert's Edge Triathlon Festival has become THE fall road trip for triathletes from around the Rocky Mountain Region! And athletes RAVED about our new warmer mid-September date in 2014! Choose the sprint or Olympic distance on Sunday (or Saturday's Off-Road), camp just 100 yards from transition, and enjoy what many have described as the most scenic tri course in the state! Swim in a beautiful desert oasis, bike on smooth pavement, and run the trail loop around the lake. There is no better way to end the Colorado tri Season.

16 Littlefoot Triathlon Bear Creek Lake Park - Lakewood, CO Website

Details: The Littlefoot Triathlon features a 750 meter swim in Soda Lake, a 15K single loop bike ride through the scenic 2,500 acre park, and a beautiful 5K run course that finishes in the expo area at the Bear Creek Marina.


Other area September Events

  • TBA - Desert's Edge Triathlon Festival - Saturday: XTERRA Fruita; Sunday: Road Sprint/Olympic - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303.642.7917
  • TBA - XTERRA Fruita - 1,200m Swim, 12 Mile MTB, 4.5 Mile Run - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303.642.7917
  • TBA - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303.642.7917
  • 16 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917

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