Event details subject to change. Please confirm all information via event website.

All Day

Chile Harvest Triathlon

Socorro City Pool 107 Franciso De Avad, Socorro

The Socorro Chile Harvest Triathlon has been running for 25+ years!! This race is a 400 m swim in the City of Socorro pool, with a 20 km bike ride […]

Wild West Relay

Budweiser Tour Center 2351 Busch Dr, Fort Collins

The Wild West Relay is a scenic point to point running adventure across Colorado. Starting in Fort Collins, teams of any size or individuals, run over mountain passes, through open […]

Rocky Mountain Half Marathon

Stanley Park 380 Community Dr, Estes Park

Escape to the mountains for some fresh air! With the Rocky Mountain Half Marathon, 5K, and Elk Double (half marathon + 5K) you can choose your own adventure! The Rocky […]

Backcountry Marathon

Rio Grande Park Aspen

Utilizing the beautiful trails that surround Aspen, and now offering three distances - 50K, marathon and heavy half-marathon, all of which run almost exclusively on dirt trails. For the first […]

Sheep Mountain Ultras

Town of Fairplay Beach Beech Rd, Fairplay

Make no mistake, the elevation profile for The Sheep Mountain 50 mile and 50k are docile looking. However, the average elevation of over 10,500’ and copious amounts of aggressive terrain, […]

Popsicle 5K

Cottonwood Creek Park 3920 Dublin Blvd, Colorado Springs

What better way to end these HOT summer days than with a Popsicle 5K, AND WE'VE ADDED A 10K & HALF MARATHON?!! Come join us for a 5K, 10K, or […]

Run for the Ring 5K

Barbara Davis Center for Diabetes 1775 Aurora Ct., Aurora

he Guild of the Children’s Diabetes Foundation hosts the 11th Annual Run for the Ring 5K Run/Walk and Kids Fun Run, bringing together the type 1 diabetes community and supporters […]

Flying Colors 5K

Loudy Simpson Park 1009 S Ranney St, Craig

Join us for an untimed Fun Run/Walk to benefit Hospice in our community.  The run will kick off a fun weekend in conjunction with the Moffat County Hot Air Balloon Festival.  […]

Kennebec Mountain Run

La Plata Campground CR 124, Durango

Join us for the Kennebec Mountain Run, a challenging 15-mile trail run through the stunning La Plata Mountains of southwest Colorado. Test your alpine running skills on this rugged course […]

Unicorn 5K

Highland Heritage Park 9651 S Quebec St, Highlands Ranch

Ready to get off the sofa and gallop around Highlands Ranch with some friends? Yeah, you are! Come frolic with us at the Unicorn Runner 5k in Highlands Ranch to […]

Two Brothers Up-and-Down 5K/10K

Courtney Ryley Cooper Park 2350 Colorado Blvd, Idaho Springs

Run your slowest 5K, then turn around and run your fastest at the Two Brothers Up-and-Down 10K on August 28th in Idaho Springs. This race climbs 1,800' in 5K and then turns around and goes back down!

Move with MADD 5K

Sloan's Lake Park 1700 Utica Street, Denver

Together We Can End Impaired Driving For Good! The 2026 Move With MADD Denver is Mothers Against Drunk Driving (MADD)'s signature fundraising event to help us raise awareness and funds […]

Wicked Wine Run

Great Lawn Park 101 Yosemite St, Denver

Founded in 2013, Wicked Wine Run is the longest running and most participated Wine Run in the country. Our journey began with a passion for combining fun, fitness, and fantastic […]

Mountain Swim Series III

Willow Creek Reservoir Co Rd 40, Granby

Racers at this beautiful reservoir will have 1 mile, 2 mile and 5K swim options. The swim will be at Willow Creek Reservoir northwest of Granby, Colorado. All swimmers must […]

Please click here to submit your event for FREE to our online calendar.
We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.