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Guide to Races in Colorado

Featured Events

Three Creeks Half Marathon
April 23, 2017

Barkin' Dog Duathlon
May 7, 2017


Mt. Evans Ascent
June 18, 2017


Evergreen Sprint Triathlon
July 23, 2017


Desert's Edge Tri Festival
Sept. 8-10, 2017


XTERRA Fruita
Sept. 9, 2017


Desert's Edge Sprint Tri
Sept. 10, 2017


Desert's Edge Olympic Tri
Sept. 10, 2017


Littlefoot Triathlon
Sept. 16, 2017


Winter Running Series
Winter 2016-2017


Chilly Cheeks Winter Duathlon Series
Winter 2016-2017


Superior Stocking Run
Dec. 11, 2016


Yeti Chase 5K/10K
Jan. 22, 2017


Ralston Creek Half Marathon & 5K
Feb. 5, 2017




January 2017

Racing Underground January Events

Date Event Location Website
14 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 2017

Racing Underground February Events

Date Event Location Website
25 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

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

March 2017

  • 4 Steamboat Pentathlon, Downhill Ski/SS/XC Ski/Bike/Run, Steamboat Springs, Colorado, 970.879.4300

April 2017

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

May 2017

Racing Underground May Events

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

Details: For 19 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

  • 7 - 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
  • 20 - Summer Open Triathlon - (0.5M Swim/12.4M Bike/3.1M Run) - Union Reservoir - Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 26 Narrow Horse Triathlon (1500m Swim/47M Bike/10M Run), Durango, 970.779.8643
  • 28 - Pelican Fest Triathlon - (800m Swim/10M Bike/5k Run) - Boardwalk Park - Windsor, Colorado - 8:00 a.m.- 970-217-6751

June 2017

  • 1 Boulder Stroke & Stride #1, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 3 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 3 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 4 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406
  • 8 Boulder Stroke & Stride #2, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 10 - Colorado Biathlon - (1M Kayak/5k Run) - Cherry Creek State Park, The Marina - Denver, Colorado - 8:00 a.m.- 703-532-6070
  • 11 Ironman Boulder Triathlon (2.6M Swim/112M Bike/26.2M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 15 Boulder Stroke & Stride #3, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 17 - Lookout Mountain Triathlon - (500m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 17 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Bellvue, Colorado - 7:50 a.m.- 303.408.1195
  • 22 Boulder Stroke & Stride #4, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 24 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
  • 24 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372
  • 24 Tri the Boat Sprint and Olympic Triathlon, Stage Coach Lake Park, Steamboat Springs, Colorado, 8:00 a.m., 941.961.7575
  • 25 - Tri on the Plains - (750m Swim/14M Bike/5k Run) - North Sterling Reservoir - Sterling, Colorado - 7:30 a.m.- 970.580.1166
  • 25 Tri the Boat Long Course Triathlon, Stage Coach State Park, Steamboat Springs, Colorado. 8:00 a.m., 941.961.7575

July 2017

Racing Underground July Events

Date Event Location Website
23 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 Events

  • 6 Boulder Stroke & Stride #5, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 8 LG Triathlon and Kids Tri (500m Swim/12M Bike/5k Run), Pool, Eagle, Colorado, 7:00 a.m., 970.328.9565
  • 8 Pagosa Duathlon, (6M Run/14M Bike/5k Run) (3M Run/8M Bike) (1M Run/2M Bike), Monument Park Road, Pagosa Springs, Colorado, 8:00 a.m., 970.264.9075
  • 9 Boulder Peak Triathlon (1.5k Swim/42k Bike/10k Run), Boulder Reservoir, Boulder, Colorado, 303.408.1195
  • 13 Boulder Stroke & Stride #6, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 15 - 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
  • 15 Frisco Triathlon (3k SUP/12k Mtn Bike/5k Run), Frisco Bay Marina, Frisco, Colorado, 9:00 a.m., 970.668.9133
  • 15 XTERRA Beaver Creek Triathlon (1M Swim/15.5M Bike/5.75M Run) (0.5M Swim/9M Bike/3M Run), Nottingham Lake, Avon, Colorado, 9:00 a.m., 970.845.5293
  • 20 Boulder Stroke & Stride #7, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 22 Kids Tryathlon (various distances), Recreation Center, Parker, Colorado, 7:00 a.m., 303.805.3278
  • 23 - Evergreen Sprint Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917
  • 27 Boulder Stroke & Stride #8, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 29 - Dash For The Splash - (250m pool Swim/8M Bike/2M Run) - Bertrum OConnor Swimming Pool- Sidney, Nebraska - 7:00 a.m.- 308-254-5355
  • 29 South Suburban Youth Tryathlon, (various distances), Cook Creek Pool, Lone Tree, Colorado, 6:30 a.m., 303.483.7029
  • 30 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 30 Rocky Mountain Triathlon (750m Swim/12M Bike/5k Run) (800m Swim/20M Bike/10k Run), North Pond Park, Silverthorne, Colorado, 8:00 a.m., 760.415.6825

August 2017

Racing Underground August Events

Date Event Location Website
TBA My Way or the Tri Way TBA Website

Details: After losing our venue in 2016, My Way or the Tri Way returns in 2017 with an exciting new venue!!! The only race where you choose the order you swim, bike, and run. DonÍt like one of the sports - no problem - just skip the one you like the least! This race has sold out 8 years in a row, and we expect to sell out again in 2017. Details coming soon!!!

Other area August Events

  • TBA - My Way or the Tri Way - (750m Swim/12M Bike/5k Run in any order!!!) - New location to be announced shortly - 303.642.7917
  • 3 Boulder Stroke & Stride #9, (750m-1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 5 - 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
  • 5 BEC Triathlon (400m Swim/15k Bike/5k Run), Nottingham Lake, Avon, Colorado, 8:00 a.m., 888.325.5940
  • 5 Ironman Boulder 70.3 (1.2M Swim/56M Bike/13.1M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 5 Splash Mash Dash Triathlon (500Y Swim/10M Bike/3.5M Run), Center at Northridge, Highlands Ranch, Colorado, 6:00 a.m., 303.791.2500
  • 6 Tri for the Cure (500m Swim/10M Bike/5k Run), Cherry Creek State Park, Denver, Colorado, 7:00 a.m., 303.430.2969
  • 13 - 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
  • 19 XTERRA Aspen Valley (1200m Swim/12M Bike/3.1M Run), Private Property, Carbondale, Colorado, 10:00 a.m., 303.408.1195
  • 26 - Glenrock Triathlon - (750m pool Swim/10M Bike/3.1M Run) - Middle School, Glenrock, Wyoming - 7:00 a.m.- 307.689.4930
  • 26 Mini Ha Ha Triathlon (300Y pool Swim/11M Bike/2M Run), Community Center Pool, Broomfield, Colorado, 7:30 a.m., 303.460.6918

September 2017

Racing Underground September Events

Date Event Location Website
16 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

  • 8-10 - Desert's Edge Triathlon Festival - Saturday: XTERRA Fruita; Sunday: Road Sprint/Olympic - Highline Lake State Park, Fruita, Colorado
  • 9 - XTERRA Fruita - 1,200m Swim, 12 Mile MTB, 4.5 Mile Run - Highline Lake State Park, Fruita, Colorado
  • 10 - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado
  • 16 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917
  • 17 - Harvest Moon Triathlon - (1.2M Swim/56M Bike/13.1M Run) - Boulder Reservoir- Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 24 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 30 Black Canyon Triathlon (500Y pool Swim/24k Bike/5k Run), Aquatic Center, Montrose, Colorado, 8:00 a.m., 970.596.4108

October 2017

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

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