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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2021-2022


Chilly Cheeks Winter Duathlon Series
Winter 2021-2022


Superior Stocking Run
Dec. 2021


Yeti Chase 5K/10K
Jan. 2022


Ralston Creek Half Marathon & 5K
Feb. 2022


Three Creeks Half Marathon
April 2022

Barkin' Dog Duathlon
April 2022


Mt. Evans Ascent
June 27, 2021


Evergreen Sprint Triathlon
July 2022


Littlefoot Triathlon
Sept. 11, 2021


Winter Running Series
Winter 2021-2022


Chilly Cheeks Winter Duathlon Series
Winter 2021-2022


Superior Stocking Run
Dec. 2021


Yeti Chase 5K/10K
Jan. 2022


Ralston Creek Half Marathon & 5K
Feb. 2022


June 2021

  • 3 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 5 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 10 Boulder Stroke & Stride (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 12 - Lookout Mountain Triathlon - (525m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 12 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Bellvue, Colorado - 7:50 a.m.- 303.408.1195
  • 17 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 17 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 24 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 26 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372
  • 27 South Suburban Kids & Adult Triathlon, Goodson Recreation Center, Centennial, Colorado, 303.798.5131
  • 28 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060

July 2021

  • 8 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 9 Frisco Triathlon, (3k SUP/12k Mtn Bike/5k Run), Frisco Bay Marina, Frisco, Colorado, 9:00 a.m., 970.668.9133
  • 10 - Tri the Boat Triathlons - (Sprint/Olympic/Half) - Stage Coach State Park- Steamboat Springs, Colorado - 8:00 a.m.- 941.961.7575 CANCELLED Check back in 2022!
  • 10 Pagosa Duathlon, (1MRun/2MBike)(3MRun/8MBike)(6MRun/14MBike), Brockover Road, Pagosa Springs, Colorado, 8:15 a.m., 970.264.1129
  • 11 - Boulder Peak Triathlon - (1.5k Swim/42k Bike/10k Run) - Boulder Reservoir - Boulder, Colorado - 303.408.1195
  • 12 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 15 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 17 - 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
  • 17 XTERRA Beaver Creek, (1mSwim/25kBike/9.3MRun)(0.5MSwim/14kBike/5kRun), Beaver Creek Resort, Avon, Colorado, 877.XTERRA.1
  • 17 Sunlight Showdown, Half Marathon/12M Mtn Bike, Sunlight Mountain Resort, Glenwood Springs, Colorado, 7:30 a.m., 970.945.7491
  • 18 - Evergreen Sprint Triathlon - (750m Swim / 12 Mile Bike/3 Mile Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917 CANCELLED will be back July 17, 2022!
  • 19 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 22 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 24 South Suburban Kids Triathlon (200YSwim/4MBike/2MRun), Cook Creek Pool, Centennial, 7:00 a.m., 303.798.5131
  • 25 - 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
  • 26 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 29 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 31 - Splashland Kids Triathlon - (various distances) - Splashland Hot Springs- Alamosa, Colorado - 9:00 a.m.- 719.298.0662
  • 31 - Dash for the Splash Triathlon - (250m pool Swim/8M Bike/2M Run)- Sydney, Nebraska - 7:30 a.m.- 308.254.5355 CANCELLED 2021
  • 31 Without Limits Open Water Swim, (1.2M/2.4M Swim), RueterHess Reservoir, Parker, Colorado, 7:00 a.m., 303.408.1195
  • 31 Lonetree Sprint Triathlon, (750mSwim/18MBike/5kRun)(750mPaddle/18MBike/5kRun)(750mSwim/18MBike), Lonetree Reservoir, Loveland, Colorado, 7:30 a.m., 970.669.6372

    August 2021

    • 1 - Stagecoach Gravel Triathlon - 750m Swim or Paddle/16M Bike/4M Run & Aquabike, Stagecoach Reservoir, Steamboat Springs, Colorado, 8:00 a.m., 303.408.1195 RESCHEDULED FOR 2022
    • 2 Dunk n Dash, 800m Swim/5k Run, Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
    • 5 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
    • 7 Splash Mash Dash Kids Triathlon, (various distances), Northridge Recreation Center, Highlands Ranch, Colorado, 9:00 a.m., 303.471.7048
    • 7 Ironman 70.3, 1.2M Swim/56M Bike/13.1M Run, Boulder Reservoir, Boulder, Colorado, 813.868.5940
    • 14 - 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
    • 15 - 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 Evergreen Kids Triathlon, (25YSwim/0.5MBike/400mRun)(50YSwim/1Mbike/0.5MRun)(100YSwim/2Mbike/1MRun), Buchanan Park Recreation Center, Evergreen, Colorado, 9:00 a.m., 720.880.1219
    • 21 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
    • 21 - 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
    • 22 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
    • 22 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406 CANCELLED

    September 2021

    Racing Underground September 2021 Events

    Date Event Location Website
    11 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 2021 Events

    • 11 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917
    • 11 - Deserts Edge OffRoad Triathlon -(1200m Swim/13M Bike/4.5M Run), Highline Lake State Park, Fruita, Colorado, 8:00 a.m. TENTATIVE DATE
    • 11 - Harvest Moon Triathlon - (1.2M Swim/56M Bike/13.1M Run) - Aurora Reservoir- Aurora, Colorado - 7:30 a.m.- 303.408.1195
    • 12 - Deserts Edge Triathlon - (sprint & Olympic), Highline Lake State Park, Fruita, Colorado, 8:00 a.m. TENTATIVE DATE
    • 12 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
    • 19 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
    • 25 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
    • 26 - Last Call Triathlon - Various Events & Distances - Boys Lake State Park - Loveland, Colorado - 7:00 a.m.

    October 2021

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