Event details subject to change. Please confirm all information via event website.
Windsor Marathon
Welcome to the annual Windsor CO Race! This year's event will start and end at The Island at Pelican Lakes in Water Valley, with a great after party including beer, […]
Run Crazy Horse Marathon
The Run Crazy Horse Marathon events begin in the shadow of the world's largest mountain carving, Crazy Horse Memorial, and finishes in the heart of the Black Hills... Hill City, […]
OTILLO Swimrun
Welcome to the world of ÖTILLÖ Swimrun! ÖTILLÖ Swimrun, the original swimrun race, embodies the spirit of adventure, endurance, and teamwork. Originating in Sweden, ÖTILLÖ translates to “island to island” […]
Michael J. Fox Foundation’s Run/Walk
We're excited to invite you to be a part of The Michael J. Fox Foundation’s Denver Run/Walk, a community event dedicated to raising awareness and funds for Parkinson's research. Lace […]
Rubey Rescue Run
Join us for a 5K uphill race on Buttermilk Mountain—with your furry friends, or without! Starting at the base near Buttermilk Mountain Lodge (formally known as Bumps) and climbing 1,700 […]
Strides for Sierra 5K
Get your sweat on running or enjoy a leisurely stroll through the beautiful neighborhood surrounding Sierra Elementary! Starting at 10:00am the little ones can participate in a 1K fun run […]
Splashland Triathlon
Catch a glimpse of the Great Sand Dunes National Park with six 14’nrs in the background Mt. Blanca, Colorado’s 3rd highest peak overlooks the valley floor.
PPRR Fall Series I
Bear Creek Regional Park 245 Bear Creek Road, Colorado Springs, CO, United StatesThe Fall Series consists of four trail races in four different city/county parks. The trails range from well-maintained to rocky with tree roots. Each event is a unique challenge at […]
Liberty Energy 5K
Please join Liberty for our 5K run and walk, benefitting the Bettering Human Lives Foundation. This family-friendly event will include live music, a beer garden, face painting, food trucks, and […]
Fall Foliage Fun Run
The best time of the year to be in Colorado! Aspen trees, perfect weather, less crowds. You don't want to miss this experience!
Long View Marathon
Showcasing a unique city-to-city trail connection, The Long View Marathon and Half Marathon runs from Fort Collins to Loveland. Together, Gnar Runners and Sweetheart City Racing bring a unique collaboration […]
Suffer Better 50K/25K Trail Run
We are stoked to once again invite you all to come run with us at Staunton State Park, off of Highway 285 near Conifer, CO, on October 15, 2022. We […]
ASDAsh 5K to Beat Tooth Decay
Join us for the University of Colorado School of Dental Medicine's Annual ASDAsh 5K to Beat Tooth Decay! This year, we will be starting and ending at Boettchers Commons! Additionally, […]
Breckenridge Road Marathon
Join us for an unforgettable two-day running experience in the heart of Breckenridge! Our RunFest Weekend kicks off Saturday with a 5K, 10K, along Main Street, followed by the Half […]
CMRA Stone House Triple-Cross
The race will begin just west of Estes St across from the Stone House Park on Bear Creek in Lakewood. It will head west mostly on dirt trails through the […]
Colorado Believe 5K
Know that you're part of something bigger. By raising awareness, we can help other families who may still be searching for answers. Any funds raised will go to Dup15q Alliance […]
Lions Roar for Fitness 5K/2.5K
So What Is the Lions Roar for Fitness 5k/2.5K Challenge? 5K Challenge — Starts promptly at 9:00 a.m. at Lake Minnequa (near CIMS), but please arrive by 8:15 a.m. There will […]
Manitou 5K
Come celebrate the beauty of Manitou Springs! Race starts and ends in Fields park. Run along the rolling creek, view the art along the Creekwalk, loop the beautiful parks full […]
Kipling Villas 5K
This race will be throughout the trails in the Kipling Villas neighborhood near Lilley Gulch Recreation Center.
Faith & Blue 5K
Join us for the 2026 Faith & Blue 5K as we bring together law enforcement, local faith communities, families, and neighbors for a morning of fellowship, unity, and community connection. […]
Footsteps for Families 5K
Join us for a heartwarming and inspiring race event that celebrates the power of community and compassion! Safe Families for Children is a remarkable Global Movement dedicated to keeping children […]
Rocky’s Backyard Ultra
Rocky's Backyard Ultra is a challenging Ultra Trail race hosted in beautiful Estes Park, Colorado. We strive to host a challenging event that is welcoming and motivating to all. "One More […]
Westy Half and 5K
Join the WESTY HALF and 5k this fall! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas. This […]
Breakthrough T1D Walk
As the leading global type 1 diabetes (T1D) research and advocacy organization, Breakthrough T1D has played a crucial role in nearly every major T1D breakthrough in history. No organization does […]
Durango Marathon
The inaugural Durango Marathon, Half Marathon, and 5k debuts on October 11, 2026, and you are invited to experience one of Colorado’s most beautiful mountain towns at the height of […]
Moony Pride 5K
This fun run is held on national coming out day this out and back Greenway 5K is here to celebrate everyone and anyone! There will be an unofficial clock and […]
Run the Rocks
Celebrating our 21st year, the American Lung Association in Colorado proudly offers the only timed-race event at the iconic, gorgeous Red Rocks Park & Amphitheatre. This unique run/walk challenge combines […]
EDT XC Showdown
Whether you run for a team, as an individual, or you just want to try out the experience of running a cross country race, you are welcome to join us […]
Kitty Beanz Cat 5K
Indian Creek Fifties
The Indian Creek Fifties takes advantage of the challenging and little used terrain just southwest of the Denver Metro area. Loop 1 climbs to 8000′, and quickly flows down into […]
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