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Guide to Races in Colorado

Featured Events

Three Creeks Half Marathon
April 3, 2016

Barkin' Dog Duathlon
May 14, 2016


Mt. Evans Ascent
June 12, 2016


Evergreen Sprint Triathlon
July 24, 2016


Desert's Edge Tri Festival
Sept. 9-11, 2016


XTERRA Fruita
Sept. 10, 2016


Desert's Edge Sprint Tri
Sept. 11, 2016


Desert's Edge Olympic Tri
Sept. 11, 2016


Littlefoot Triathlon
Sept. 17, 2016


Winter Running Series
Winter 2016-2017


Chilly Cheeks Winter Duathlon Series
Winter 2016-2017


Superior Stocking Run
Dec. 2016


Yeti Chase 5K/10K
Jan. 2017


Ralston Creek Half Marathon & 5K
Feb. 2017


January 2016

Racing Underground January Events

Date Event Location Website
16 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 2016

Racing Underground February Events

Date Event Location Website
20 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

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

March 2016

  • 5 Steamboat Pentathlon, Downhill Ski/SS/XC Ski/Bike/Run, Steamboat Springs, Colorado, 970.879.4300
  • 6 - Moab Off-Road Duathlon - Klondike Bluffs Area - Moab, Utah - 970-389-4838

April 2016

  • 2 Winter Park Wipe Out Adventure Race, Hideaway Park, Winter Park, Colorado, 877.328.2783
  • 23 Imperial Challenge, 6.2M Bike/Ascent/Descent, Recreation Center, Breckenridge, Colorado, 10:00 a.m., 303.517.7046

May 2016

Racing Underground May Events

Date Event Location Website
14 18th Annual Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 18 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

  • 14 - 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
  • 21 - Summer Open Triathlon - (0.5M Swim/12.4M Bike/3.1M Run) - Union Reservoir - Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 22 - Fort Collins Triathlon/Duathlon - (450Y pool Swim/13M Bike/3M Run) - EPIC Pool - Fort Collins, Colorado - 7:00 a.m.- 970.482.0551
  • 22 - Original Meowler Mountain Duathlon - (15 Mile MTB/10M Trail Run/15 Mile MTB) - Gunnison, Colorado
  • 22 Tri the Rock Youth Triathlon (various distances), Butterfield Park, Castle Rock, Colorado, 8:00 a.m., 720.733.2284
  • CANCELLED - Pelican Fest Triathlon - (800m Swim/10M Bike/5k Run) - Pelican Lake- Windsor, Colorado - 8:00 a.m.- 970.308.4499

June 2016

  • 2 Boulder Stroke & Stride, (750m 1500m Swim/5k Run) (Run Only) (Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 4 - Longmont Kids Triathlon - (various distances) - Centennial Pool- Longmont, Colorado - 7:45 a.m.- 303.651.8406
  • 4 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 4 Center Beginner Triathlon (0.25M Swim/10M Bike/5k Run), Sand Dunes Pool, Hooper, Colorado, 7:00 a.m., 719.850.3439
  • 5 - Longmont Triathlon - (525Y Swim/12M Bike/5k Run) - Centennial Pool- Longmont, Colorado - 7:00 a.m.- 303.651.8406
  • 8 Boulder Stroke & Stride, (750m 1500m Swim/5k Run) (Run Only) (Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 11 Ironman 70.3, (1.2M Swim/56M Bike/13.1M Run), Boulder Reservoir, Boulder, Colorado, 813.868.6070
  • 16 Boulder Stroke & Stride, (750m 1500m Swim/5k Run) (Run Only) (Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 18 - Lookout Mountain Triathlon - (500m pool Swim/10M Bike/5k Run) - Mt Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303.960.8129
  • 18 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Bike) - Lory State Park - Fort Collins, Colorado - 7:50 a.m.- 303.408.1195
  • 23 Boulder Stroke & Stride, (750m 1500m Swim/5k Run) (Run Only) (Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 25 TriBella Sprint Triathlon, (0.5M Swim/10M Bike/5k Run) (0.25M Swim/8M Bike/2M Run), Cherry Creek State Park, Denver, Colorado, 8:00 a.m., 303.408.1195
  • 25 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372
  • 25 Tri the Boat Sprint & Olympic Triathlon, Goodwin Recreational Center/deKoevend Park, Steamboat Springs, Colorado, 8:00 a.m., 941.961.7575
  • 26 - Tri on the Plains - (750m Swim/14M Bike/5k Run) - North Sterling Reservoir - Sterling, Colorado - 7:30 a.m.- 970.580.1166
  • 26 South Suburban Youth Tryathlon, (various distances), Goodwin Recreation Center, Centennial, Colorado, 6:30 a.m., 303.483.7029
  • 26 Tri the Boat Half Iron Triathlon, Stage Coach State Park, Steamboat Springs, Colorado, 8:00 a.m., 941.961.7575
  • 28 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195

July 2016

Racing Underground July Events

Date Event Location Website
24 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

  • 5 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195
  • 7 Boulder Stroke & Stride (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 9 LG Tri & Kids Tri, (500m Swim/12M Bike/5k Run), Pool, Eagle, Colorado, 7:00 a.m., 970.328.9565
  • 9 Pagosa Duathlon (6M Run/12.5M Bike/5k Run) (3M Run/7M Bike), Monument Park Road, Pagosa Springs, Colorado, 8:00 a.m., 970.264.9075
  • 12 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195
  • 14 Boulder Stroke & Stride (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 15 - Triathlon on Friday - (0.5M Swim/12M Bike/5k Run) - Cherry Creek State Park - Denver, Colorado - 6:00 p.m.- 303.843.0100
  • 16 XTERRA Beaver Creek (1M Swim/15.5M Bike/5.75M Run) (0.5M Swim/9M Bike/3M Run), Notthingham Lake, Avon, Colorado, 9:00 a.m., 970.845.5293
  • 17 - Steamboat Lake Triathlon - (750m Swim/12.4M Bike/3.5M Run) - Steamboat Lake State Park - Steamboat Springs, Colorado - 8:00 a.m.- 303.408.1195
  • 21 Boulder Stroke & Stride (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 24 - Evergreen Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303.642.7917
  • 26 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195
  • 28 Boulder Stroke & Stride (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 30 XTERRA Aspen Valley (1200m Swim/12M Bike/3.1M Run), Private Property, Carbondale, Colorado, 10:00 a.m., 303.408.1195
  • 30 South Suburban Youth Tryathlon (various distances), Cook Creek Pool, Lone Tree, Colorado, 6:30 a.m., 303.483.7029

August 2016

  • 2 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195
  • 4 Boulder Stroke & Stride (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 6 - Dash for the Splash Triathlon - (250m Swim/8M Bike/2M Run) - Sydney, Nebraska - 7:30 a.m.- ood, Colorado, 8:00 a.m., 720.281.5938
  • 18 Bacon Burner, 6k, Marina, Frisco, Colorado, 9:30 a.m., 970.668.9133
  • 18 Asha for Education Run, 5k, Highlands Heritage Park, Highlands Ranch, Colorado, 9:00 a.m., 303.727.0248
  • 18 Leadville Trail Races, Half/Marathon, 6th Street Gym, Leadville, Colorado, 8:00 a.m., 719.219.9351
  • 18 FiBark Road Races, 5k/10k, Thonhoff Park, Salida, Colorado, 8:00 a.m., 719.539.6738
  • 19 Fathers Day Run, 5k/10k, Apex Center, Arvada, Colorado, 8:00 a.m., 720.722.4226
  • 19 Buffs 4 Life Kyle Macintosh Memorial Run, 5k, Omni Int308.254.5825
  • 6 - Dash for the Splash GrKids Triathlon -(distances vary by age) - Sydney, Nebraska - 9:30 a.m.- 308.254.5825
  • 6 BEC Triathlon (400m Swim/15k Bike/5k Run), Notthingham Lake, Avon, Colorado, 8:00 a.m., 888.325.5940
  • 6 XTERRA Snow Mountain Ranch, (1000m Swim/14M Bike/4M Run), Gaylord Reservoir, Winter Park, Colorado, 10:00 a.m., 303.960.8129
  • 6 Splash Mash Dash Triathlon (500Y Swim/10M Bike/3.5M Run) (1100Y Swim/20M Bike/6.2M Run), Center at Northridge, Highlands Ranch, Colorado, 6:00 a.m., 303.791.2500
  • 7 Ironman Triathlon (2.6M Swim/112M Bike/26.2M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 7 Tri for the Cure (500m Swim/10M Bike/5k Run), Cherry Creek State Park, Denver, Colorado, 7:00 a.m., 303.430.2969
  • 7 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
  • 9 Aquaman Series (0.5M/1M/1.5M/2M Swim Only or Aquathlon), Cherry Creek State Park, Denver, Colorado, 6:15 a.m., 303.408.1195
  • 11 Stroke & Stride Series (750m or 1500m Swim/5k Run, Run Only, Swim Only), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 13 Durango Triathlon (500Y Swim/13M Bike/5k Run), Community Recreation Center, Durango, Colorado, 8:00 a.m., 970.375.5000
  • 14 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike 3.1M Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195
  • 20 Tinman Triathlon, Pool, Lamar, Colorado, 7:00 a.m., 719.336.4376
  • 21 - Steamboat Triathlon - (1.5k Swim/24.8M Bike/10k Run) (1.5k Swim/40k Bike) (0.5M Swim/12.5M Bike/5k Run) - Lake Catamount- Steamboat Springs, Colorado - 8:00 a.m.- 303.408.1195
  • 27 - XTERRA Buffalo Creek Triathlon - (1500m Swim/22M bike/5M Run) - Wellington Lake- Bailey, Colorado - 8:00 a.m.- 303.408.1195
  • 27 Without Limits Open Water Swim (1.2M/2.4M), Boulder Reservoir, Boulder, Colorado, 7:00 a.m., 303.408.1195
  • 28 Stapleton Kids Triathlon (various distances), Jet Stream Pool, Denver, Colorado, 8:00 a.m., 303.388.0724

September 2016

Racing Underground September Events

Date Event Location Website
10 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.


11 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.

17 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

  • 9-11 - 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
  • 10 - 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
  • 11 - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303.642.7917
  • 17 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.642.7917
  • 18 - Harvest Moon Triathlon - (1.2M Swim/56M Bike/13.1M Run) - Boulder Reservoir- Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 25 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195

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

December 2016

Racing Underground December Events

Date Event Location Website
TBD 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


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egional Park, Highlands Ranch, Colorado, 9:00 a.m., 720.722.4226

September 2016