Event details subject to change. Please confirm all information via event website.
Highline Canal Summer Scamper
The fourth annual High Line Canal Summer Scamper, 5K for All, will take place on the evening of June 24 at Bible Park in Denver. Before the 5K enjoy a […]
Race in the Clouds Dirt Festival
Get ready for a weekend of epic outdoor adventure at 10,600 feet in beautiful Alma, Colorado—the highest incorporated town in North America! Whether you love mountain biking, trail running, off-road […]
Four Legged 5K
Come one, come all to the first annual "Four Legged 5k" foot race, organized and hosted by the Bailey Chamber of Commerce and benefiting one of our local non-profit organizations, […]
The John Cappis
What A free mountaineering jaunt originated by James Varner in honor of the legendary John Cappis, one of the founders of the Hardrock 100. The course gets tweaked from year […]
Timberview Trail Run
Crisp morning air and a summer sunrise in Colorado. YES PLEASE! Join us on the foothills at Lory State Park for a fun & beautiful morning trail race. This run […]
Lake to Lake Triathlon
Loveland Lake to Lake Triathlon has welcomed athletes from Northern Colorado, this entire state, region, country, and outside the USA for 24 years and we are excited about our 2025 […]
Slacker Half Marathon
Seize the chance to earn your bragging rights as a true Slacker! Embark on this exhilarating journey starting at the base of Loveland Ski Area, perched at an impressive elevation […]
Pride 5K
The Denver Pride 5K is more than just a race—it's a powerful way for supporters of The Center on Colfax to make a difference in the lives of Colorado’s LGBTQ+ […]
Trail Town Races
The Trail Town Races. Hosted by the San Juan Mountain Runners, the event offers sweeping views of the San Juan Mountains and takes place just a short 30-minute drive south […]
Leadville Trail Marathon
Leadville 124 E. Sixth Street, Leadville, CO, United StatesRun through the historic mining district’s challenging old mining roads and trails, and hit a high of 13,185 feet at Mosquito Pass during the Leadville Trail Marathon or Heavy Half […]
Before The Fourth 5K
Come join the Before The Fourth 5k for some healthy fun in Clement Park. The park is located just south of Denver, in Littleton, Colorado. This is a great opportunity […]
SBT TRL
This is a trail run on the scenic single track trails of historic Howelsen Hill. Held in conjunction with the SBT GRVL bike event, this will be a lot of […]
Walk For Hope! 5K
This walk is about showing up for those in our community who have experienced breast cancer, are in treatment, and those we honor and remember. Stand alongside our clients, ambassadors, […]
Estes Park Backyard Ultra
The Backyard Ultra with the views. The Backyard Ultra is a form of Ultra race where runners must complete 4.167 miles in less than one hour, every hour, until only one […]
Sunlight Showdown 5K
Sunlight Mountain Resort 10901 County Road 117, Glenwood Springs, CO, United StatesWelcome to the Sunlight Mountain Race Series, where mountain air, winding trails, and a vibrant community come together for an unforgettable summer of running. For seven years, our half marathon […]
Pearl Street Mile
Join Troop Events on Saturday August 6th for the 25th annual Pearl Street Mile, a criterium multi-lapped course that starts on Spruce St, and completes 3.75 laps around the Boulder Court House and up the Pearl Street Mall. This year, the race is the USATF Colorado One Mile Championships! There will be a Kids 800m, Family and Friends 1-Mile, time based 1-Mile waves, Masters 1-Mile races, and Elite Open 1-Mile races.
Chase the Moon Trail Race
Chase the Moon is a 12-hour team relay and solo ultramarathon, run overnight under the light of the full moon in the Highlands Ranch Backcountry trail system (we promise some […]
Blue Sky Ascent
Although the air will be noticeably thin at the starting line, Echo Lake's 10,600 feet of elevation is just the beginning. The climb totals nearly 4,000 vertical feet - much […]
Boulder Sunrise Triathlon
Join us in celebrating the start of summer in the triathlon capital of the country, Boulder, CO. An athlete favorite with its breath-taking sunrise swim, fast bike and smooth run […]
SSPR TRYathlon
Swim, bike, run for fun! This is the perfect starting point to try a tri. These races are about completion, not competition. All athletic levels are welcome. The only prerequisite is that you must […]
Boulder Sunrise 5K/10K
The Boulder Sunrise 10k & 5k Run has a reputation of being one of the most scenic courses around. BBSC will provide runners with a supported course, including plenty of […]
July 4th ROCK-IT RUN
Join Run to Change Lives at the Douglas County Event Center in Castle Rock for the 2nd Annual ROCK-IT RUN 5K, Half Marathon and 1K Little Rock-It RUN (8 years and under). It’s time to start a new tradition on July 4th and feel good about Changing Lives. Save 15% with coupon code CORUNNER.
July 4th Fun Run
Run, skip, hop, gallop, lolly gag or moon walk on July 4th with your friends and family to support Palmer Lake Elementary School at the Annual July 4th Fun Run. […]
The Niwot Mile
Start off your July 4th with s point to point downhill mile starting at Niwot High School and finishing at Niwot market - the Niwot Downhill Mile! This year is […]
Freedom 5K
Let Freedom Run
Dress up as your favorite American Hero! This could be your mom, dad, Albert Einstein, Batman, Superman, or the Powerpuff girls! This event is all about celebrating GREAT people who […]
Firekracker 5K
Kick off your Fourth of July with the FireKracker 5k in City Park, Fort Collins! Whether you walk, jog, run, or race, this community favorite welcomes all ages and abilities […]
Freedom Run 5K
Join Mount Evans Home Health and Hospice for the 40th annual Freedom Run 5K in Evergreen on July 4th! The scenic 5-kilometer (3.1 miles) course follows gently rolling terrain through residential areas, beginning at 8 am Evergreen Middle School and ending with a festive finish line at Nick’s Pro Fitness.
The Rundola
The Telluride Foundation is hosting the annual Fourth of July foot race, the Rundola. The Rundola is an open registration uphill foot race. Runners start at the base of the […]
Independence Day 10K
Don't miss this favorite event of the 4th of July celebration! This scenic 10K trail running race offers up some of the best views in the Breckenridge! This race is […]
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