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Guide to Races in Colorado

Featured Events

Mile High Duathlon Series
Spring 2014


Big Sky Duathlon
April 13, 2014


West Side Duathlon
April 27, 2014


Barkin' Dog Duathlon
May 10, 2014


Crescent Moon Triathlon
Sprint & Olympic
June 7, 2014


Mt. Evans Ascent
June 14, 2014


Front Range Triathlon Series
Summer 2014


Evergreen Sprint Triathlon
July 27, 2014


My Way or the Tri Way
August 23, 2014


Littlefoot Triathlon
Sept. 6, 2014


XTERRA Fruita
Sept. 13, 2014


Desert's Edge Tri Festival
Sept. 13-14, 2014


Winter Running Series
Winter 2014-2015


Chilly Cheeks Winter Duathlon Series
Winter 2014-2015


Superior Stocking Run
Dec. 2014


Yeti Chase 5K/10K
Jan. 2015


Ralston Creek Half Marathon & 5K
Feb. 2015


Mile High Duathlon Series
Spring 2014


Big Sky Duathlon
April 13, 2014


West Side Duathlon
April 27, 2014


December 2013

Racing Underground December Events

Date Event Location Website
14 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


January 2014

Racing Underground January Events

Date Event Location Website
18 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

  • 18 - Chilly Cheeks Winter Duathlon #2 - (1.5M Run/3.6M Bike/2.5M Run/7.2M Bike) - Cherry Creek State Park - Denver, Colorado - 10:00 a.m. - 303-642-7917
  • 18 - Arrowhead Alpine Winter Triathlon (5k Snowshoe/10k Bike/8k Skate Ski) - CMC Timberline Campus - Leadville, Colorado - 10:00 a.m. - 970-845-0931

February 2014

Racing Underground February Events

Date Event Location Website
22 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

  • 8 - Winter Festival Ice Bike Race - (laps for 30-45 min) - Evergreen Lake - Evergreen, Colorado - 9:00 a.m. - 720-880-1226
  • 15 - Mt. Taylor Winter Quadrathlon - (12M Bike/5M Run/2M Ski/2M Snowshoe/4M Ski/5M Run/13M Bike) - Grants, New Mexico - 800-748-2142
  • 22 - Chilly Cheeks Winter Duathlon #3 - (10.8M Bike/4M Run) - Cherry Creek State Park - Denver, Colorado - 10:00 a.m. - 303-642-7917

March 2014

  • 8 - Steamboat Pentathlon - (400' downhill ski/3M Snowshoe/4M XC Ski/12M Mtnbike/5M Run) - Shorter courses available - Steamboat Springs, Colorado - 970-879-4300

April 2014

Racing Underground April Events


Date Event Location Website
13 Big Sky Duathlon Dick's Sporting Goods Park Website

Details: The kick-off to the 15th edition of the Mile High Duathlon Series! The Big Sky Duathlon moves to a new spring date and a new Denver venue in 2014. With a flat, fast, spectator-friendly course at Dick's Sporting Goods Park, just minutes from the I-25 & I-70 intersection, this is the perfect event for triathletes looking for some tune-up events before the summer tri season, yet we welcome first-timers looking to try something new. The Mile High Duathlon Series has seen more than 2,000 first-time multisport participants!

Date Event Location Website
27 West Side Duathlon Arvada, Colorado Website

Details: The West Side Duathlon moves to a new spring date in 2014! The course remains the same, with it's amazing bike and run routes - some of the best in Colorado!. Choose from 5K-30K-5K or the shorter 1.5 mile run, 9.3 mile bike, 5K run. This is race number two in the 2014 Mile High Duathlon Series.

Other area April Events

  • 13 - Big Sky Duathlon - (4K Run/20K Bike/4k Run) - Dicks Sporting Goods Park - Denver, Colorado - 9:00 a.m.- 303-642-7917
  • 13 - Tri the Rim Triathlon - (500Y pool Swim/11M Bike/5k Run) - Clocktower @ Fort Lewis College - Durango, Colorado - 10:00 a.m. - 970-247-7220
  • 27 - West Side Duathlon - (5K Run/30K Bike/5k Run or 1.5 mile Run/15K Bike/5K Run) - North Area Athletic Complex - Arvada, Colorado - 7:30 a.m.- 303-642-7917

May 2014

Racing Underground May Events

Date Event Location Website
10 16th Annual Barkin' Dog Duathlon Cherry Creek State Park - Aurora, CO Website

Details: For 16 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

  • 10 - 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
  • 11 - Team River Runner Colorado Biathlon - (1M Kayak/5k Run) - Cherry Creek State Park - Denver, Colorado - 9:00 a.m. - 703-532-6070
  • 17 - Summer Open Triathlon - (0.5M Swim/12.4M Bike/3.1M Run) - Union Reservoir - Longmont, Colorado - 8:00 a.m. - 303-408-1195
  • 18 - Tri The Rock Youth Triathlon - (various distances) - Butterfield Park - Castle Rock, Colorado - 8:00 a.m. - 720-733-2284
  • 24 - Pelican Fest Triathlon - (800m Swim/10M Bike/5k Run) - Pelican Lake - Windsor, Colorado - 8:00 a.m. - 970-308-4499
  • 25 - Mile High Multisport Open Water Swim Challenge - (0.5M/1.2M/2.4M/Relays Open Water Swim) - Grant Lake - Littleton, Colorado - 8:00 a.m. - 720-291-4938
  • 31 - Longmont Kids Triathlon - (various distances) - Centennial Pool - Longmont, Colorado - 6:30 a.m. - 303-651-8406
  • 31 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Fort Collins, Colorado - 7:50 a.m. - 303-408-1195

June 2014

Racing Underground June Events

Date Event Location Website
7 Crescent Moon Sprint Tri Aurora Reservoir - Aurora, CO Website

Details: There is no better way to start the Front Range triathlon season than the Crescent Moon! Enjoy a 750 meter swim in crystal clear water, a 20K closed bike course, and a scenic 5K run on a mix of bike path and well maintained dirt roadways. Celebrate with a catered meal, a fantastic sponsor expo, and an atmosphere you can only get at a Racing Underground event!


7 Crescent Moon Olympic Tri Aurora Reservoir - Aurora, CO Website

Details: New this year, the Crescent Moon Tri adds an Olympic distance option! The Front Range needs an early summer Olympic tri, and with our new June date, we are thrilled to offer you the option of swimming 1,500 meters, biking 40K, and running 10 kilometers. We hope you are as excited as we are!


Other area June Events

  • 1 - Foothills Feat Mini Sprint Triathlon & Kids Triathlon - (475Y Swim/11.6M Bike/3.5M Run) (Kids-275Y Swim/6.3M Bike/2.4M Run) - Heritage High School - Littleton, Colorado - 6:30 a.m. - 303-579-9488
  • 1 - Boulder Sprint Triathlon - (0.5M Swim/17M Bike/5k Run) - Boulder Reservoir, Colorado - 813-868-5940
  • 5 - Boulder Stroke & Stride Series #1 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 7 - Crescent Moon Sprint Triathlon - (750m Swim/20k Bike/5k Run) - Aurora Reservoir - Aurora, Colorado - 8:00 a.m. - 303-642-7917
  • 7 - Crescent Moon Olympic Triathlon - (1,500m Swim/40k Bike/10k Run) - Aurora Reservoir - Aurora, Colorado - 8:00 a.m. - 303-642-7917
  • 7 - HRCA Tune Up Triathlon (500Y pool Swim/12M Bike/5k Run) - Recreation Center at Westridge - Highlands Ranch, Colorado - 6:00 a.m. - 303-791-2500
  • 11 - Boulder Stroke & Stride Series #2 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 14 - Highline Hustle - (500m Swim, 16 mile bike, 3 mile run) - Loma, Colorado - 970-254-3864
  • 15 - 70.3 Boulder - Boulder Reservoir - Boulder, Colorado - 813-868-5940
  • 19 - Boulder Stroke & Stride Series #3 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 21 - Lookout Mountain Triathlon - (500m Swim/10M Bike/5k Run) - Mt. Vernon Country Club - Golden, Colorado - 6:30 a.m.- 303-960-8129
  • 21 - Give it a Tri Kids Tri & Mini Sprint Tri - Olde Town Hot Springs Pool - Steamboat Springs, Colorado - 7:30 a.m.
  • 21 - Nixie Waves Open Water Swim - (1.2M/2.4M) - Aurora Reservoir - Aurora, Colorado - 303-359-8042
  • 22 - XTERRA Curt Gowdy - (1200m Swim/14.1M Bike/5.3M Run)- Curt Gowdy State Park - Cheyenne, Wyoming - 9:00 a.m. - 303-408-1195
  • 22 - Tri on the Plains - (750m Swim/14M Bike/5k Run)- North Sterling Reservoir State Park - Sterling, Colorado - 7:30 a.m. - 970-580-1166
  • 24 - Denver Aquaman Series #1 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 26 - Boulder Stroke & Stride Series #4 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 28 - Lake To Lake Triathlon - (1.5k Swim/30M Bike/10k Run) - High School - Loveland, Colorado - 6:30 a.m. - 970-669-6372
  • 28 - TriBella Triathlon - (womenÕs only sprint & super sprint) - Cherry Creek State Park - Denver, Colorado - 8:00 a.m. - 303-408-1195
  • 29 - Steamboat Springs Half Iron & Olympic Triathlons - (Olympic & Half)- Stage Coach State Park - Steamboat Springs, Colorado - 7:30 a.m.

July 2014

Racing Underground July Events

Date Event Location Website
27 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.

Other area July Events

  • 1 - Denver Aquaman Series #2 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 5 - 2nd Annual MHM Cancer Sucks Freedom Race - (0.5M/1.2M/2.4M/Relays Open Water Swim) - Grant Lake - Littleton, Colorado - 8:00 a.m. - 720-291-4938
  • 8 - Denver Aquaman Series #3 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 10 - Boulder Stroke & Stride Series #5 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 12 - Suburban Youth Tryathlon - (various distances) - Goodwin Recreation Center - Centennial, Colorado - 6:30 a.m. - 303-483-7029
  • 13 - Boulder Peak Triathlon - (1.5k Swim/42k Bike/10k Run) - Boulder Reservoir - Boulder, Colorado - 813-868-7518
  • 15 - Denver Aquaman Series #4 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 17 - Boulder Stroke & Stride Series #6 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 19 - USAT Youth Splash & Dash - (various distances) - Fort Collins, Colorado
  • 20 - Steamboat Lake Sprint Triathlon - (750m Swim/12.4M Bike/3.5M Run) - Steamboat Lake State Park- Steamboat, Colorado - 8:00 a.m. - 303-408-1195
  • 22 - Denver Aquaman Series #5 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 24 - Boulder Stroke & Stride Series #7 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195
  • 26 - XTERRA Aspen Valley - (1200m Swim/12M Bike/3.1M Run) - Private Property - Carbondale, Colorado - 10:00 a.m. - 303-408-1195
  • 27 - Evergreen Triathlon - (750m Swim/12M Bike/5k Run) - Evergreen Lake House - Evergreen, Colorado - 7:00 a.m.- 303-642-7917
  • 29 - Denver Aquaman Series #6 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 30 - Boulder Stroke & Stride Series #8 - (750m/1200m Swim/5k Run)- Boulder Reservoir - Boulder, Colorado - 6:00 p.m. - 303-408-1195

August 2014

Racing Underground August Events

Date Event Location Website
23 My Way or the Tri Way Aurora Reservoir - Aurora, CO Website

Details: The Funnest Tri you will do this year! My Way or the Tri Way allows you to pick the order you swim, bike, and run. Don't like one of the three sports? Then choose a 2-event option like bike-run-bike or swim-run-swim. Enjoy a cold wet finisher towel and a catered post-race lunch once you are done. This is also a family-friendly event with a jumpy castle for the kids and sign making station for your spectators!

Other area August Events

  • 2 - BEC Triathlon - (400m Swim/15k Bike/5k Run) - Nottingham Lake - Avon, Colorado - 8:00 a.m. - 888-325-6343
  • 2 - Dash for the Splash Triathlon - (250m Swim/8 Mile Bike/2 Mile Run) - Sidney, Nebraska - 7:30 a.m. - 308-254-5825
  • 2 - Kids TRY-athlon - (various distances) - Cook Creek Pool/Sweetwater Park - Lone Tree, Colorado - 6:30 a.m. - 303-483-7029
  • 2 - Aspen Triathlon - (800Y pool Swim/17M Bike/4M Run) - Recreation Center - Aspen, Colorado - 7:00 a.m. - 970-544-4100
  • 2 - XTERRA Pagosa Springs - (1k Swim/18.5M Bike/6.9M Run) - Lake Pagosa - Pagosa Springs, Colorado - 9:00 a.m. - 970-398-0612
  • 3 - Ironman Boulder - (2.4M Swim/112M Bike/26.2M Run) - Boulder Reservoir - Boulder, Colorado - 813-868-5940
  • 3 - Tri for the Cure - (500m Swim/10M Bike/5k Run) - Cherry Creek State Park - Denver, Colorado - 7:00 a.m. - 303-430-2969
  • 3 - Iron Kids Triathlon - (various distances) - Boulder Reservoir - Boulder, Colorado - 813-868-7518
  • 5 - Denver Aquaman Series #7 - (0.5M/1M/1.5M/2M Swim Only - 0.5M/1M Swim/5k Run)- Cherry Creek State Park - Denver, Colorado - 6:15 p.m. - 303-408-1195
  • 10 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/3.1M Run) - Union Reservoir, Longmont, Colorado - 8:00 a.m. - 303-408-1195
  • 10 - Kids for Kids Tri - (various distances) - Fraser Valley Recreation Center - Winter Park, Colorado - 8:00 a.m. - 970-509-9029
  • 16 - Beyond the Horizon Triathlon - (Olympic & Half) - Grand Lake, Colorado - 6:45 a.m.
  • 16 - USAT Youth Splash & Dash - (various distances) - Steamboat Springs, Colorado
  • 17 - Steamboat Triathlon - (Sprint & Olympic) - Lake Catamount - Steamboat Springs, Colorado - 8:00 a.m. - 303-408-1195
  • 17 - Yolo Triathlon - (Olympic & Sprint) - Aurora, Colorado - 6:45 a.m.
  • 23 - My Way or the Tri Way Where you pick the order! - Triathlon (swim, bike & run) - Duathlon (run & bike) - Aquathlon (swim & run) - Aquabike (swim & bike) - (750m Swim/20k Bike/3.5 mile Run) - Aurora Reservoir - Aurora, Colorado - 7:30 a.m. - 303-642-7917
  • 24 - XTERRA Buffalo Creek - (1500m Swim/22M Bike/5M Run) - Wellington Lake - Bailey, Colorado - 8:15 a.m. - 303-408-1195
  • 30 - Without Limits Open Water Swim - (1.2M/2.4M) - Boulder Reservoir - Boulder, Colorado - 303-408-1195

September 2014

Racing Underground September Events

Date Event Location Website
6 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.


13 Desert's Edge Off-Road Triathlon Highline Lake State Park - Fruita, CO Website

Details: In just two years, the Desert's Edge Triathlon Festival has become THE fall road trip for triathletes from around the Rocky Mountain Region! This year, we move to a new, warmer weekend in mid-September! 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.


14 Desert's Edge Sprint & Olympic Tri Highline Lake State Park - Fruita, CO Website

Details: In just two years, the Desert's Edge Triathlon Festival has become THE fall road trip for triathletes from around the Rocky Mountain Region! This year, we move to a new, warmer weekend in mid-September! 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 course in the state! Swim in a beautiful desert oasis, bike on smooth rural farm roads, and run the trail loop around the lake. There is no better way to end the Colorado tri Season.

Other area September Events

  • 6 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303-642-7917
  • 7 - Harvest Moon Triathlon - (1.2M Swim - 56M Bike - 13.1M Run) - Aurora Reservoir - Aurora, Colorado - 7:30 a.m. - 303-408-1195
  • 13 - 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
  • 13-14 - 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
  • 14 - Desert's Edge Sprint & Olympic Tri - Highline Lake State Park, Fruita, Colorado - 9:00 a.m.- 303-642-7917
  • 14 - Bear it All Off Road Tri & Du - (1k Swim/11M Bike/4M Run) (2.3M Run/11M Bike/4M Run) - Bear Creek Lake Park, Lakewood, CO 9:00 a.m. - 303-518-0232
  • 21 - Oktoberfest Triathlon - (750m Swim/12.4M Bike/3.1M Run) - Union Reservoir - Longmont, Colorado - 8:00 a.m. - 303-408-1195
  • 27 - Black Canyon Triathlon - (500y Swim, 14.6 mile bike, 5k run) - Montrose, Colorado - 970-596-4108

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