Event details subject to change. Please confirm all information via event website.
Gypsum Daze 5K
The Gypsum Daze 5K Run/Walk is a tradition in Gypsum-32 years strong. Serious runners can go for a PR, but we invite everyone to head out for some exercise and […]
OCA Panda Run 5K
Come join Organization of Chinese Americans' Charity 5K Panda Run or OCA 1K panda walk on Saturday 7/18/2026 at 9 am at MSU - Regency Athletic Complex. Stay after the […]
Gastro-Dash 10K
The Berthoud Gastro-Dash 10K is not just a footrace; it’s an epic, hilarious test of both speed and stomach, challenging runners to tackle a 6.2-mile course punctuated by mandatory food […]
TransRockies Run
The TransRockies Run (Pass to Pub) is a trail running stage race also known as “Summer Camp for Big Kids”! A three stage race traversing the continental divide between Hope […]
Barr Trail Mountain Race
The Barr Trail Mountain Race is one of the Front Range’s historic summer mountain running events. The 12.6-mile course begins at the Cog Railway Station (6,570 ft) in Manitou Springs, Colorado, ascends […]
Donor Dash
The Donor Dash is an annual 5K that honors, celebrates, and recognizes those touched by organ and tissue donation.
Kendall Mountain Run
Meet the mountain this summer in Silverton, Colorado! The Kendall Mountain Run starts in downtown Silverton and traverses jeep roads to within a final 300 vertical foot scramble to the […]
Floyd Hill Dash
Calling all adventurers and nature lovers! It's time to cool down, head to Idaho Springs for the Floyd Hill Dash 5k! Picture yourself surrounded by breathtaking mountain views, crisp fresh […]
Never Summer Ultra
The Never Summer 100km & 60km will take place almost entirely within the boundaries of State Forest State Park and run between the Never Summer Mountains on the northern border […]
Pikes Peak Ultra
Pikes Peak Ultra was created in 2015 to showcase some of the very best trails in Colorado Springs. As a teenager, RD Justin Ricks trained on these trails and dreamed […]
Aspen Valley Marathon
Mark your calendars – Don’t miss out on this exhilarating race through the stunning landscapes of Aspen, Colorado! Join us for a one-of-a-kind experience that you’ll cherish forever. The Aspen […]
Elevation Run/Walk
The Elevation Run/Walk is celebrating its 10th Anniversary on July 30th. Featuring a timed 10k race, USATF Certified timed 5k race, and 2 mile fun run. The race is held […]
Box Canyon Trail Runs
The Box Canyon 30K is a scenic and tough loop through the high country of Telluride, Colorado. Runners will leave Telluride heading East towards Bridal Veil Falls. Ascending a rough […]
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 […]
Creede 100
The Creede 100 start and finishes in one of Colorado’s true historic mining towns. Creede once drew a rough and tumble crowd with its abundant silver, now we flock their […]
Pancreatic Cancer Awareness 5K
5K run/walk hosted by the loved ones of Diana Cantu. Remembering our mother, Diana Cantu, and honoring her legacy. She bravely fought this disease as the resilent person that she […]
Enchanted Forest Trail Race
Come celebrate the outdoors this summer with The Face Challenge, Heavy Half Marathon, or Full Marathon in the breathtaking “Land of Enchantment.” Spend a weekend conquering rugged trails, soaking in […]
Golddigger 5K
A 5K fundraiser for Clear Creek Cross Country in the mountains just west of the Denver area.
The Hero’s Journey 5K
The 7/20 Foundation is proud to present the 1st annual Hero’s Journey 5K Run/Walk on July 23rd in Aurora. This unique point to point race makes its way through Aurora's City Center and culminates in the 7/20 Memorial Reflection Garden.
Spirit of the West 5K
Please join the Westernaires for the Spirit of the West 5K run / walk and 1K Family Fun run on July 31st in Golden, CO.
Steamboat Lake Sprint Triathlon
After last summer this event instantly became a personal favorite for our staff, volunteers, and athletes - come find out why! We couldn't be more excited about this course, this […]
Summit 200
The Summit 200 has always been a dream race for us. The route is extraordinary in both its beauty and difficulty. Runners traverse one 200-mile loop around Summit County, Colorado […]
Chile Harvest Triathlon
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
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 5K
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 […]
Rocky Mountain Half Marathon
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
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
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
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
The 12th annual Run for the Ring 5K Run/Walk and Kids Fun Run brings together Barbara Davis Center for Diabetes (BDC), patients, loyal supporters, and running enthusiasts to run for […]
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.