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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2019-2020


Chilly Cheeks Winter Duathlon Series
Winter 2019-2020


Superior Stocking Run
Dec. 15, 2019


Yeti Chase 5K/10K
Jan. 26, 2020


Ralston Creek Half Marathon & 5K
Feb. 9, 2020


Three Creeks Half Marathon
April 4, 2020

Barkin' Dog Duathlon
April 18, 2020


Mt. Evans Ascent
June 14, 2020


Evergreen Sprint Triathlon
July 19, 2020


Littlefoot Triathlon
Sept. 12, 2020


Winter Running Series
Winter 2019-2020


Chilly Cheeks Winter Duathlon Series
Winter 2019-2020


Superior Stocking Run
Dec. 15, 2019


Yeti Chase 5K/10K
Jan. 26, 2020


Ralston Creek Half Marathon & 5K
Feb. 9, 2020


January 2020

Racing Underground January 2020 Events

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

Details: The second event in the 2019-202 Chilly Cheeks Duathlon Series. This low-cost, low-key series offers three run-bike events at DenverÕs 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 2020 Events

  • 11 - Chilly Cheeks Winter Duathlon Series - (1.5 Mile Run/10 Mile Bike/2.5 Mile Run) - Cherry Creek State Park - Denver, CO - 10:00 a.m.- 303-642-7917
  • 26 Reverse Indoor TRYathlon, (20min Run/30min Bike/10min Swim), Goodson Recreation Center, Centennial, Colorado, 7:30 a.m., 303.483.7034

February 2020

Racing Underground February 2020 Events

Date Event Location Website
22 Chilly Cheeks Winter Duathlon Series Cherry Creek State Park, Hobie Hill Group Area, Denver Website

Details: The third event in the 2019-2020 Chilly Cheeks Duathlon Series. This low-cost, low-key series offers three run-bike events at Denverês 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 2020 Events

  • 15 Mt Taylor Quadrathlon, (Bike/Run/Ski/SS/Ski/Run/Bike), Mt Taylor, Grants, New Mexico, 505.287.4802
  • 22 - 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 2020


April 2020

Racing Underground April 2020 Events

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

Details: For 23 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 2020 Events

  • 18 - 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
  • 25-26 - James O Rourke Memorial Triathlons - (500Y Swim/14M Bike/5k Run) (Kids Triathlon) - North Platte Recreation Center - North Platte, Nebraska - 8:30 a.m.-

May 2020

  • 9 Ordinary Mortals Triathlon, (5k Run/12M Bike/300Y pool Swim), CSU Pueblo Student Recreation Center, Pueblo, Colorado, 9:00 a.m., 719.549.3363
  • 16 Pole, Pedal, Paddle (Back country ski/Bike/Kayak), Crested Butte Mountain Resort, Crested Butte to Gunnison, Colorado, 719.221.1710
  • 22 Narrow Horse Triathlon, (1500m Swim/47M bike/10M Run), Durango, Colorado, 970.779.8643
  • 31 - The EPIC Mini Triathlon - (450M pool swim / 10 mile bike / 2 mile run) - EPIC Pool Center- Fort Collins, Colorado - 7:25 a.m.

June 2020

  • 4 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 6 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 6 - Lookout Mountain Triathlon - (525m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 11 Boulder Stroke & Stride (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 13 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Bellvue, Colorado - 7:50 a.m.- 303.408.1195
  • 18 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 20 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
  • 25 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 27 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372

July 2020

Racing Underground July 2020 Events

Date Event Location Website
19 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 2020 Events

  • 9 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 11 - 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
  • 11 - Tri the Boat Triathlons - (Sprint/Olympic/Half) - Stage Coach State Park- Steamboat Springs, Colorado - 8:00 a.m.- 941.961.7575
  • 11 Frisco Triathlon, (3k SUP/12k Mtn Bike/5k Run), Frisco Bay Marina, Frisco, Colorado, 9:00 a.m., 970.668.9133
  • 12 - Boulder Peak Triathlon - (1.5k Swim/42k Bike/10k Run) - Boulder Reservoir - Boulder, Colorado - 303.408.1195
  • 16 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 18 Kids TRYathlon, (various distances), Recreation Center, Parker, Colorado, 8:00 a.m., 303.841.4500
  • 19 - Evergreen Sprint Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917
  • 23 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 25 Without Limits Open Water Swim, (1.2M/2.4M Swim), RueterHess Reservoir, Parker, Colorado, 7:00 a.m., 303.408.1195
  • 26 - Steamboat Lake Triathlon - (750m Swim/12.4M Bike/3.5M Run) (750m Swim/12.4M Bike) (750m PaddleBoard/12.4M Bike/3.5M Run) - Steamboat Lake State Park - Steamboat Springs, Colorado - 303.408.1195
  • 30 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195

August 2020

  • 1 - Dash for the Splash Triathlon - (250m pool Swim/8M Bike/2M Run)- Sydney, Nebraska - 7:30 a.m.- 308.254.5355
  • 1 - XTERRA Indian Peaks Triathlon - (1000m time trial Swim/22k Mtn Bike/7k trail Run) - Eldora Nordic Center - Nederland, Colorado - 9:30 a.m.- 303.960.8129
  • 1 Ironman 70.3, 1.2M Swim/56M Bike/13.1M Run, Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 2 - Stagecoach Gravel Triathlon - 750m Swim or Paddle/16M Bike/4M Run & Aquabike, Stagecoach Reservoir, Steamboat Springs, Colorado, 8:00 a.m., 303.408.1195
  • 9 - 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
  • 15 - Splashland Kids Triathlon - (various distances) - Splashland Hot Springs- Alamosa, Colorado - 9:00 a.m.- 719.298.0662
  • 16 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 16 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 29 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 29 - Longmont Adult Beginner Try-A-Tri Triathlon - (200Y pool Swim/4.5M Bike/2k Run) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 30 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406

September 2020

Racing Underground September 2020 Events

Date Event Location Website
12 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 2020 Events

  • 12 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917
  • 12 - Deserts Edge OffRoad Triathlon -(1200m Swim/13M Bike/4.5M Run), Highline Lake State Park, Fruita, Colorado, 8:00 a.m.
  • 12 - Harvest Moon Triathlon - (1.2M Swim/56M Bike/13.1M Run) - Aurora Reservoir- Aurora, Colorado - 7:30 a.m.- 303.408.1195
  • 13 - Deserts Edge Triathlon - (sprint & Olympic), Highline Lake State Park, Fruita, Colorado, 8:00 a.m.
  • 13 Sundance Duathlon (2M Run/6.5M Bike/2M Run)(18M Run/11M Bike/5k Run), Cheyenne Mountain State Park, Colorado Springs, Colorado, 7:00 a.m., 719.355.3573
  • 20 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 27 - Last Call Triathlon - Various Events & Distances - Boys Lake State Park - Loveland, Colorado - 7:00 a.m.

October 2020

  • 3 Black Canyon Triathlon (500& Swim/24k Bike/5k Run), Community Rec Center, Montrose, Colorado, 8:00 a.m., 970.596.4108
  • 17 - Splashland Triathlon - (5k Run/10M Bike/400yd Swim) - Splashland - Alamosa, Colorado - 9:00 a.m.- 719.298.0662
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