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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2018-2019


Chilly Cheeks Winter Duathlon Series
Winter 2018-2019


Superior Stocking Run
Dec. 16, 2018


Yeti Chase 5K/10K
Jan. 20, 2019


Ralston Creek Half Marathon & 5K
Feb. 3, 2019


Three Creeks Half Marathon
April 2019

Barkin' Dog Duathlon
May 2019


Mt. Evans Ascent
June 8, 2019


Evergreen Sprint Triathlon
July 21, 2019


Littlefoot Triathlon
Sept. 15, 2018


Winter Running Series
Winter 2018-2019


Chilly Cheeks Winter Duathlon Series
Winter 2018-2019


Superior Stocking Run
Dec. 16, 2018


Yeti Chase 5K/10K
Jan. 20, 2019


Ralston Creek Half Marathon & 5K
Feb. 3, 2019


December 2018

Racing Underground December 2018 Events

Date Event Location Website
8 Chilly Cheeks Winter Duathlon Series Cherry Creek State Park Hobie Hill Lot, Denver Website

Details: The first event in the 2018-2019 Chilly Cheeks Duathlon Series. This low-cost, low-key series offers three run-bike events at DenverŐs Cherry Creek State Park during the winter months. Each event is chip timed, and features a different format, covering approximately 4 miles of running and 10 miles of biking. The December event starts with a 4-mile run and finishes with a 10.8 mile paved bike ride. The run covers a mix of road, paved bike path and well maintained dirt trails. Road bike and fat tire divisions are offered. Post race hot food & drinks provided. Series entrants receive a pair of Chilly Cheeks Sweat Pants!!! A 4-Mile Run-Only option is offered as well.

Other area December 2018 Events


January 2019

Racing Underground January 2019 Events

Date Event Location Website
12 Chilly Cheeks Winter Duathlon Series Cherry Creek State Park Hobie Hill Lot, Denver Website

Details: The second event in the 2018-2019 Chilly Cheeks Duathlon Series. This low-cost, low-key series offers three run-bike events at DenverŐs Cherry Creek State Park during the winter months. Each event is chip timed, and features a different format, covering approximately 4 miles of running and 10 miles of biking. The January event starts with a 2.5 mile run, followed by a 10.8 mile paved bike ride, and concludes with a 2.5 mile run. Road bike and fat tire divisions are offered. Post race hot food & drinks provided. Series entrants receive a pair of Chilly Cheeks Sweat Pants!!! A 4-Mile Run-Only option is offered as well.

Other area January 2019 Events


February 2019

Racing Underground February 2019 Events

Date Event Location Website
23 Chilly Cheeks Winter Duathlon Series Cherry Creek State Park Hobie Hill Lot, Denver Website

Details: The third event in the 2018-2019 Chilly Cheeks Duathlon Series. This low-cost, low-key series offers three run-bike events at DenverŐs Cherry Creek State Park during the winter months. Each event is chip timed, and features a different format, covering approximately 4 miles of running and 10 miles of biking. The February event starts with a 10.8 mile paved bike ride, followed by a 4 mile run. The run covers a mix of road, paved bike path and well maintained dirt trails. Road bike and fat tire divisions are offered. Post race hot food & drinks provided. Series entrants receive a pair of Chilly Cheeks Sweat Pants!!! A 4-Mile Run-Only option is offered as well.

Other area February 2019 Events

  • 16 Mt Taylor Quadrathlon, (Bike/Run/Ski/SS/Ski/Run/Bike), Mt Taylor, Grants, New Mexico, 505.287.4802
  • 23 - Chilly Cheeks Winter Duathlon Series - (10 Mile Bike/4 Mile Run) - Cherry Creek State Park - Denver, CO - 10:00 a.m.- 303-642-7917

March 2019


April 2019

Racing Underground April 2019 Events

Date Event Location Website
20 Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 21 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 April 2019 Events

  • 20 - 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
  • 28 Pole, Pedal, Paddle (Back country ski/Bike/Kayak), Crested Butte Mountain Resort, Crested Butte to Gunnison, Colorado, 719.221.1710

May 2019

  • 26 - The EPIC Mini Triathlon - (450M pool swim / 10 mile bike / 2 mile run) - EPIC Pool Center- Fort Collins, Colorado - 7:25 a.m.
  • 30 Boulder Stroke & Stride, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195

June 2019

  • 1 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 1 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 2 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406
  • 6 Boulder Stroke & Stride #2, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 9 Ironman Boulder Triathlon (2.6M Swim/112M Bike/26.2M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 13 Boulder Stroke & Stride #3, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 15 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Bellvue, Colorado - 7:50 a.m.- 303.408.1195
  • 20 Boulder Stroke & Stride #4, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 22 TriBella Womens Triathlon (0.5M Swim/10M Bike5k Run) (0.25M Swim/8M Bike/2M Run), Cherry Creek Reservoir, Denver, Colorado, 8:00 a.m., 303.408.1195
  • 22 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372
  • 27 Boulder Stroke & Stride #4, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 29 - Lookout Mountain Triathlon - (525m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129

July 2019

Racing Underground July 2019 Events

Date Event Location Website
21 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 meter 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 2019 Events

  • 4 Cortez Burst Triathlon & Kids Triathlon, (500Y Swim/11.5M Bike/5k Run), Parque De Vida Park, Cortez, Colorado, 7:00 a.m., 970.749.6180
  • 11 Boulder Stroke & Stride #6, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 13 - San Rafael Classic Triathlon - (750m Swim/15.5M Bike/52.9M Run) (1M Swim/31M Bike/5.8M Run) - Huntington State Park- Huntington, Utah - 6:30 a.m.- 801-505-8481
  • 13 Frisco Triathlon (3k SUP/12k Mtn Bike/5k Run), Frisco Bay Marina, Frisco, Colorado, 9:00 a.m., 970.668.9133
  • 13 Pagosa Duathlon (6mi Run/14mi MTB) or (3mi Run/8mi MTB) or Kids 1mi Run/2Mi MTB) - Pagosa Springs, Colorado, 7:30 a.m., 970-264-1129
  • 14 - Boulder Peak Triathlon - (1.5k Swim/42k Bike/10k Run) - Boulder Reservoir - Boulder, Colorado - 303.408.1195
  • 18 Boulder Stroke & Stride #7, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 21 - Evergreen Sprint Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917
  • 25 Boulder Stroke & Stride #8, (750m to 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 27 Without Limits Open Water Swim, 1.2M/2.4M Swim, Rueter Hess Reservoir, Parker, Colorado, 7:00 a.m., 303.408.1195

August 2019

  • 1 Boulder Stroke & Stride #9, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 3 - Dash for the Splash Triathlon - (250m pool Swim/8M Bike/2M Run)- Sydney, Nebraska - 7:30 a.m.- 308.254.5355
  • 3 Ironman Boulder 70.3 (1.2M Swim/56M Bike/13.1M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 10 - XTERRA Indian Peaks Triathlon - (1k Swim/23k MTB/7k Run) - Eldora Mountain Resort - Nederland, Colorado - 9:00 a.m.- 303.960.8129
  • 11 - Steamboat Catamount Sprint and Olympic Triathlon - (750m Swim/12.4M Bike/5k Run) (1500m Swim/24.8M Bike/10k Run) - Lake Catamount- Steamboat Springs, Colorado - 8:00 a.m.- 303.408.1195
  • 17 - Splashland Kids Triathlon - (various distances) - Splashland Hot Springs- Alamosa, Colorado - 9:00 a.m.- 719.298.0662
  • 17 Tinman Triathlon, Lamar, Colorado, 719.336.4376
  • 18 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195

September 2019

Racing Underground September 2019 Events

Date Event Location Website
14 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 2019 Events

  • 7 - Boyd Lake Bash Multisport Festival - Various Events & Distances - Boys Lake State Park - Loveland, Colorado - 7:00 a.m.
  • 14 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917
  • 15 - Harvest Moon Triathlon - (1.2M Swim/56M Bike/13.1M Run) - Boulder Reservoir- Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 22 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 28 - Carter Lake Crusher Triathlon - (800M swim / 18.8 mile bike / 4.5 mile run) - Carter Lake South Shore Campground - Berthoud, Colorado - 7:25 a.m.

October 2019

  • 19 - Splashland Triathlon - (5k Run/10M Bike/400yd Swim) - Splashland - Alamosa, Colorado - 9:00 a.m.- 719.298.0662
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