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Guide to Races in Colorado

Featured Events

Mile High Duathlon Series
Spring 2015


Big Sky Duathlon
April, 2015


West Side Duathlon
April, 2015


Barkin' Dog Duathlon
May 9, 2015


Crescent Moon Triathlon
Sprint & Olympic
June, 2015


Mt. Evans Ascent
June, 2015


Front Range Triathlon Series
Summer 2015


Evergreen Sprint Triathlon
July 26, 2015


My Way or the Tri Way
August, 2015


Littlefoot Triathlon
Sept. 2015


XTERRA Fruita
Sept. 12, 2015


Desert's Edge Tri Festival
Sept. 12-13, 2015


Winter Running Series
Winter 2014-2015


Chilly Cheeks Winter Duathlon Series
Winter 2014-2015


Superior Stocking Run
Dec. 14, 2014


Yeti Chase 5K/10K
Jan. 25, 2015


Ralston Creek Half Marathon & 5K
Feb. 8, 2015


Mile High Duathlon Series
Spring 2015


Big Sky Duathlon
April, 2015


West Side Duathlon
April, 2015


NOVEMBER 2014


December 2014

Racing Underground December Events

Date Event Location Website
20 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 2015

Racing Underground January Events

Date Event Location Website
17 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 2015

Racing Underground February Events

Date Event Location Website
21 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

  • 14 - Mt. Taylor Winter Quadrathlon - (12M Bike/5M Run/2M Ski/2M Snowshoe/4M Ski/5M Run/13M Bike) - Grants, New Mexico - 800-748-2142
  • 21 - Chilly Cheeks Winter Duathlon #3 - (10.8M Bike/4M Run) - Cherry Creek State Park - Denver, Colorado - 10:00 a.m. - 303-642-7917

March 2015


April 2014

Racing Underground April Events


Date Event Location Website
TBD Big Sky Duathlon Dick's Sporting Goods Park Website

Details: The kick-off to the 16th edition of the Mile High Duathlon Series! The Big Sky Duathlon is a great season opener, with a flat, fast, spectator-friendly course. This is the perfect event for triathletes looking for some tune-up events before the summer tri season, yet we welcome first-timers looking to try something new. The Mile High Duathlon Series has seen more than 2,000 first-time multisport participants!

Date Event Location Website
TBD West Side Duathlon Arvada, Colorado Website

Details: The West Side Duathlon brings you amazing bike and run routes - some of the best in Colorado!. Choose from 5K-30K-5K or the shorter 1.5 mile run, 9.3 mile bike, 5K run. This is race number two in the 2015 Mile High Duathlon Series.

Other area April Events

  • TBD - Big Sky Duathlon - (4K Run/20K Bike/4k Run) - Denver, Colorado - 9:00 a.m.- 303-642-7917
  • TBD - West Side Duathlon - (5K Run/30K Bike/5k Run or 1.5 mile Run/15K Bike/5K Run) - North Area Athletic Complex - Arvada, Colorado - 7:30 a.m.- 303-642-7917

May 2015

Racing Underground May Events

Date Event Location Website
9 17th Annual Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 17 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

  • 9 - 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 2015

Racing Underground June Events

Date Event Location Website
TBD 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 in crystal clear water, a 20K closed 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!


TBD 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, and is the perfect tune-up race for the Boulder IM events. Great swag and post-race food await!!!


Other area June Events


July 2015

Racing Underground July Events

Date Event Location Website
26 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

  • 26 - Evergreen Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303-642-7917

August 2015

Racing Underground August Events

Date Event Location Website
TBD 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


  • TBD - 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 2015

Racing Underground September Events

Date Event Location Website
TBD 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.


12 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.


13 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.

Other area September Events

  • TBD - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303-642-7917
  • 12 - 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
  • 12-13 - 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
  • 13 - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303-642-7917

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