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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2015-2016


Chilly Cheeks Winter Duathlon Series
Winter 2015-2016


Superior Stocking Run
Dec. 13, 2015


Yeti Chase 5K/10K
Jan. 24, 2016


Ralston Creek Half Marathon & 5K
Feb. 7, 2016


Three Creeks Half Marathon
April 3, 2016


Barkin' Dog Duathlon
May 14, 2016


Crescent Moon Triathlon
Sprint & Olympic
June 2016


Mt. Evans Ascent
June 11, 2016


Front Range Triathlon Series
Summer 2016


Evergreen Sprint Triathlon
July 24, 2016


My Way or the Tri Way
August 27, 2016


Desert's Edge Tri Festival
Sept. 10-11, 2016


XTERRA Fruita
Sept. 10, 2016


Desert's Edge Sprint & Olympic Tri
Sept. 11, 2016


Littlefoot Triathlon
Sept. 17, 2016


Winter Running Series
Winter 2015-2016


Chilly Cheeks Winter Duathlon Series
Winter 2015-2016


Superior Stocking Run
Dec. 13, 2015


Yeti Chase 5K/10K
Jan. 24, 2016


Ralston Creek Half Marathon & 5K
Feb. 7, 2016


January 2016

Racing Underground January Events

Date Event Location Website
16 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 2016

Racing Underground February Events

Date Event Location Website
20 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

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

March 2016


April 2016


May 2016

Racing Underground May Events

Date Event Location Website
14 18th Annual Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 18 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

  • 14 - Barkin' Dog Duathlon - (5K Run/30K Bike/5k Run or 2K Run/15K Bike/5K Run) - Cherry Creek State Park - Aurora, Colorado - 7:00 a.m.- 303.642.7917

June 2016

Racing Underground June Events

Date Event Location Website
11 Crescent Moon Sprint Tri Aurora Reservoir - Aurora, CO Website

Details: There is no better way to start the Front Range triathlon season than the Crescent Moon! Enjoy a 750 meter swim, a fast 20K bike course, and a scenic 5K run on a mix of bike path and well maintained dirt roadways. Celebrate with a catered meal, a fantastic sponsor expo, and an atmosphere you can only get at a Racing Underground event!


11 Crescent Moon Olympic Tri Aurora Reservoir - Aurora, CO Website

Details: The first Olympic tri of the year on the Front Range! Our early June date make this the perfect test of your winter training! Great swag and post-race food await!!!


Other area June Events

  • 11 - Crescent Moon Sprint Triathlon - (750m Swim/20k Bike/5k Run) - Aurora Reservoir - Aurora, Colorado - 8:00 a.m. - 303.642.7917
  • 18 - Lookout Mountain Triathlon - (500m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 26 - Tri on the Plains - (750m Swim/14M Bike/5k Run) - North Sterling Reservoir - Sterling, Colorado - 7:30 a.m.- 970.580.1166

July 2016

Racing Underground July Events

Date Event Location Website
24 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

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

August 2016

Racing Underground August Events

Date Event Location Website
27 My Way or the Tri Way Aurora Reservoir - Aurora, CO Website

Details: The Funnest Tri you will do this year! My Way or the Tri Way allows you to pick the order you swim, bike, and run. Don't like one of the three sports? Then choose a 2-event option like bike-run-bike or swim-run-swim. Enjoy a cold wet finisher towel and a catered post-race lunch once you are done. This is also a family-friendly event with a jumpy castle for the kids and sign making station for your spectators!

Other area August Events

  • 27 - My Way or the Tri Way Where you pick the order! - Triathlon (swim, bike & run) - Duathlon (run & bike) - Aquathlon (swim & run) - Aquabike (swim & bike) - (750m Swim/20k Bike/3.5 mile Run) - Aurora Reservoir - Aurora, Colorado - 7:30 a.m. - 303.642.7917

September 2016

Racing Underground September Events

Date Event Location Website
10 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.


11 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.

17 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

  • 9-11 - 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
  • 10 - 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
  • 11 - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303.642.7917
  • 17 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917

December 2016

Racing Underground December Events

Date Event Location Website
TBD 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


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