Event details subject to change. Please confirm all information via event website.
USAFA Half Marathon
Rio Grande 100
The Rio Grande 100 starts and finishes on the banks of the mighty Rio Grande River in beautiful South Fork, Colorado. The race takes you though the amazing La Garita mountains, from arid forest to alpine tundra peaking out over 12,000 foot above sea level 4 times. You will enjoy golden aspen leaf covered trails […]
Smoky Hill Community 5K
3rd annual Smoky Hill Community 5k walk/run fundraiser
Walk Like MADD
Walk Like MADD is MADD's signature fundraising event to help us raise both awareness and funds to end drunk driving and fight drugged driving. With every step taken and each dollar raised, walkers are supporting MADD’s lifesaving mission to keep our families and communities safe.
Q Man Classic 5K
Highlands Ranch High School (HRHS) is proud to once again host the annual Q-Man Classic. This is a memorial race for Quinton Sanford, a student-athlete with Autism at HRHS who sadly passed away his sophomore year. Proceeds from the race will benefit Teaching the Autism Community Trades (T.A.C.T.). T.A.C.T envisions a world where neuro-diversity is […]
Walk for Life 5K
This will be our annual Walk for Life 5K. Our course will begin at the Raynolds/Ash Street bridge in the parking lot across from the Rec District building. The race will run West this year from that point, towards the surgery center & we will have it clearly marked out for walkers vs runners (5K). […]
Unicorn 5K
Ready to get off the sofa and gallop around Aurora with some friends? Yeah, you are! Come frolic with us at the Unicorn Runner 5k at Arapahoe County Fairgrounds! You'll earn a sweet tee shirt! It's a 5k distance for all, and whether you walk, trot, canter or gallop, we'll be happy to see you! […]
Calarat Challenge Trail Running Festival
Join us Labor Day weekend for the Calarat Challenge Trail Running Festival. We start the festivities off on Saturday night with a 5K that you can run, walk or hike, and our Kids 1K. Then on Sunday morning, we have the 1/2 MARATHON and 10K. All trail races start and finish at the Cal-Wood Education […]
Tava Waters 5K
Orangetheory 5K
Join us for the annual Orangetheory 5k at Labor Day Lift Off. Starting from the IAFF Fallen Firefighters Memorial (northwest corner of Memorial Park), head through the side streets of Memorial Park, around Prospect Lake and finish back at the memorial. The 5K race will start at 9 a.m., but come early and watch around […]
Mighty Marmot Kids Trail Race #1
Come join the Vail Recreation District for the 3rd Annual Mighty Marmot Kids Trail Race Series! Youths ages 4 to 10 are welcome to participate. Chose between 1 or 2 miles* to compete amongst your friends and celebrate with awards and ice cream after you finish! *4-year-olds can only race in the 1 mile category This series includes […]
CASA Superhero 5K
We invite you to join us for the sixth annual CASA Superhero Run at Two Rivers Park in Glenwood Springs. We recognize that all children need heroes, but abused children need superheroes! Be a hero for children in need by participating in our annual CASA Superhero Run. Your involvement helps us provide crucial advocacy and […]
Denver Rocks Run 5K/10K
We all know Denver is known for its world-class cultural attractions, thriving craft breweries, and red-hot music scene. Be part of the first 5K/10K running event of its kind with this rock n' roll infused run that kicks off at Civic Center Park in downtown Denver on November 6, 2021.
New Vision 5K
The New Vision 5K Run/Walk exists to support New Vision Charter School, a public school in the Thompson School District. It's main purpose is to provide our staff and students with wellness opportunities throughout the school year. The Wellness program educate our students on how to make healthy choices throughout their lives, through good nutrition […]
For a City 5K
Hey Runners! Did you know that Douglas County has one of the highest percentages of teen suicide in the United States? Thrive Church is committed to awareness of this crisis and being on the solution side of the problem. We've partnered with the Children's Hospital to take intentional steps to make a difference, and we […]
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.
Jungle Dash
Come join us for a 1-mile fun run, as we kick off the Wild Wonderful Saturday events. Plan to stay and check out the Wild Zone. Welcome adventurers, explorers, and vine-swinging daredevils! You are invited to join us for a ROARING good time! This is going to be the WILDEST Jungle Dash of the year! […]
Oktoberfest 5K Trail Run
The Oktoberfest 5K returns this fall on Saturday, September 13th, offering an active start to a festive weekend. Lace up your running shoes and experience the changing aspens and beautiful scenery in this 5K trail run on Town of Breckenridge Trails, finishing right in Blue River Plaza on Main Street in time to enjoy the […]
Canceled Sloan’s Lake Search Party Marathon
THE SUMMARY Did you know that the loop around Sloan's Lake in Denver Colorado is almost perfectly 2.62 miles around? Join us as we go around the lake every hour on the hour for 10 hours to complete a full Marathon or every other hour for 10 hours to complete a Half Marathon (if you decide to […]
Mighty Marmot Kids Trail Race #2
Come join the Vail Recreation District for the 3rd Annual Mighty Marmot Kids Trail Race Series! Youths ages 4 to 10 are welcome to participate. Chose between 1 or 2 miles* to compete amongst your friends and celebrate with awards and ice cream after you finish! *4-year-olds can only race in the 1 mile category This series includes […]
D49 4.9K
Join us for the D4.9k Run/Walk, a family-friendly event open to D49 staff, students, parents, and community members! Our mission is to offer an engaging, affordable, and healthy event for everyone in our community. The event kicks off at 8:30am, with the D4.9K Run/Walk starting at 9am. Bring your little ones for the free 49-yard […]
St. Jude Walk/Run
Event Description: St. Jude Walk/Run is a family friendly 5K event, taking place at Dick’s Sporting Goods Park on September 23rd. Participants come together during Childhood Cancer Awareness Month to help support the lifesaving mission of St. Jude: Finding cures. Saving children®. Other details: Registration is free and participants are encouraged to share their fundraising page […]
Move Forward 5K/10K
The Move Forward 5K/10K is an event created by the Doctor of Physical Therapy students at Regis University as a community outreach project. The proceeds from the event will benefit Canine Companions for Independence and the Foundation for Physical Therapy.
Rock Cut Estes Park 5K
Join us for The Rock Cut Estes Park 5k on September 20, 2025, for a 5k-ish, fun run event that starts and ends at this awesome taproom in Estes Park. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft brew at the finish line. Start windows […]
Be Ovary Aware 5K
Raise awareness for ovarian cancer and raise funds to support Coloradans with 7 different types of gynecologic cancers: Ovarian, fallopian tube, uterine/endometrial, cervical, vaginal, vulvar and peritoneal cancers. This event benefits Sue Gift - Gynecologic Cancer Support.
Golden Leaf Half Marathon
13.1 mile trail race with nearly 1000 ft of elevation gain from Snowmass to Aspen
Mountain Chile Cha Cha Trail Races
The Mountain Chile Cha Cha Trail Race offers a 5K and 10k race. The races begin just outside downtown Pagosa Springs, CO, on Reservoir River Ranch, where you'll run on jeep and ATV trails and enjoy breathtaking views of the San Juan Mountains. The course offers varied terrains - fast flats, moderate slow hill climbs, […]
Estes Epic
Join us for the Estes Epic — a premier event featuring a 50k Bike Race, 50k Run, and Heavy Half Marathon. After a six-year hiatus, this challenging race returns, offering participants rugged trails, significant climbs, and breathtaking views of Rocky Mountain National Park. Event Details: 50k Bike Race (Saturday) Tackle 50 kilometers of demanding terrain, […]
Colorado Brain Tumor 5K
The Colorado brain tumor community will come together for a 5K Walk/Run to raise awareness and funds to support the needs of patients with brain tumors and their families.
Canceled Rising Phoenix 5K
The Rising Phoenix Festival & 5K Run/Walk for Suicide Prevention is Combat Recovery Foundation's first community awareness event. Runners, walkers, dogs and participants of all ages, volunteers, and spectators will gather together in celebration of life. The 5K provides an important sense of community for suicide loss and trauma survivors and creates a space for […]
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