Event details subject to change. Please confirm all information via event website.
Grand Valley Backyard Ultra
This is a true last-man-standing event, and it will go until there is only one runner left, no matter how long it takes. Unlike all other competition race formats, this one isn’t about speed. It’s about grit, determination, and pure will to finish another lap. When you’ve had enough and don’t think you can finish […]
The Pretzel Run
Oktoberfest in Colorado!! Owned and managed by a Bavarian Race Director.... The Annual PRETZEL RUN will move 8 blocks down to Louisville Community Park for a LARGER BIER GARDEN, LIVE MUSIK and 4 Trail Races. Hlaf Marathon, 10k, 5k and Kids Mile. (Allows more room for the race) and the park will allow for a […]
Rut Run 5K
With the Fall Season, Estes Park shines in colors and wilderness experiences! Herds of Elk begin to roam the meadows and open fields; while sounds of bugling Bull Elk call out their territory. Join us as we acknowledge this unique season at the RUT RUN 5K as part of ‘ELK FEST’. Kick starting the weekend of […]
I Can 5K
You CAN 5k. This event is for EVERY ONE. EVERY BODY. You won't get lost. You won't get forgotten. You'll run a clearly marked 5k loop with multiple portojohns & aid stations along the way. And if you're up for a 10k you'll be running the same loop one more time! We're going to keep […]
Miles for Moms
Join us at the FloCrit campus and surrounding neighborhoods in southwest Denver for the Annual Miles for Moms Run/Walk/Roll! Lace up your running shoes for a fantastic 3-mile fundraiser run, where we celebrate the triumphs of the amazing teen mothers we support. A welcome and kick-off program will start off the event, followed by the […]
Crazy Horse Fast 5K
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, South Dakota
Grace Race 5K
Help eRace World Hunger at Rainbow Trail Lutheran Camp’s Annual Grace Race! This annual 5k run/walk was started as part of RTLC’s 50th anniversary in 2007, to raise money for ELCA World Hunger. The event is held in collaboration with the Rocky Mountain Synod Hunger Network. Over the last 15 years, RTLC and the participants […]
Hot Chocolate 15K/10K/5K
Start and finish at Civic Center Park amongst Denver's biggest chocolate aficionados. All participants receive a technical running quarter zip with registration. Runners can also enjoy hot chocolate, chocolate fondue, and dipping snacks at the post-race party! It’s not just a race, it’s an experience. Register today!
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, music and live entertainment! New to the series is a Full Marathon distance, as well as the Half Marathon and Heavy 10K.
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, South Dakota
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” in Swedish, reflecting the essence of the sport where participants traverse across a series of islands by swimming and running, often in challenging and picturesque […]
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 up your sneakers and join us as we come together to make a difference in the lives of those living with Parkinson's disease. Event Highlights: […]
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 feet to the Cliff House, this timed race ends with stunning views of the Maroon Bells. Prizes for top 3 female and male finishers. Also […]
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 around the Sierra track. Afterwards stay and enjoy the Race Village with vendors, food, drinks and activities for the kids all while supporting the Sierra […]
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 to Colorado’s running scene in this one-of-a-kind race event.
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 creek side trees with a short piece on the Bear Creek bike path. Near the Fox Hollow golf course the route crosses Bear Creek 3 […]
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 who provides family support and promotes awareness, research, and targeted treatments for Dup15q syndrome.
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 of murals, sculptures, disc golf, skateparks and more. The path is flat and accessible to all. Run/walk. Bring your family, bring your neighbor, bring your […]
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 is one of the few 5k events where FINISHER MEDALS are awarded to each participant.
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 more to improve everyday life with T1D—from therapy development and access, to expanding research, advocacy, and community support. Breakthrough T1D Walk is the world’s largest […]
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 fall. Set against crisp high-country air and peak autumn foliage, this road race showcases scenic paved routes winding through and around Durango, with a start […]
Run the Rocks
We are hosting our 21st annual Run the Rocks on October 11th from 8:15AM - 1PM. We’re biased, but we think it’s an event no one should miss! Run the Rocks is the only race permitted in the legendary Red Rocks Park & Amphitheatre. Over 1,500 participants will enjoy live music along the route, party with […]
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 the Grand Valley for a few gorgeous pink sunrise soaked miles. This loop almost seems friendly, until you’re given a few sharp stabs in the […]
Bobcat Trail Races
Bobcat Trail Race was created to feature one of Colorado Spring’s best city parks, Palmer Park. Runners will enjoy views of the city and Pikes Peak from the rocky bluffs. Come out and enjoy this amazing trail system, right in the heart of the city! Formerly a Mad Moose Event & graciously passed on to […]
Blue Sky Trail Marathon
Taking place on the trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space, the Blue Sky courses take you on a north-south tour of the easternmost hogbacks of Northern Colorado’s Front Range mountains. With a moderate amount of elevation gain and loss and a variety of terrain, the route offers a little bit […]
Living Water 5K
5K Fun Run race and family friendly 1mile run/walk to help support communities who are in dire need of clean, sustainable water solutions and those suffering from recent disasters. The event will be held at the lovely Berkeley Lake park (across from Lakeside Amusement park), and will be a timed, point to point race following […]
Sean May Memorial Run
The run/walk is held to honor Sean May, a Chief Deputy District Attorney with the 17th Judicial District Attorney’s Office who was murdered in his backyard in 2008 when he was returning home from work. During his seven years of service in Adams County, May served in a variety of assignments, including a rotation in […]
Great Trailhead Foot Race
Welcome to the Great Trailhead Foot Race at Bear Creek Lake Park! Featuring legitimate TRAILS in the shadow of Denver's skyline, you'll love the single-track and dirt as you race 5 miles, or a double lap of 10 miles to the finish line party!
Canyonlands Ultra
Canyonlands 100K, 50 Mile, 50K, Marathon, Half Marathon, and 15K Canyonlands Ultra starts and finishes at the Behind the Rocks Trail, along the border of the Behind the Rocks Wilderness Study Area. Moab's last hidden gem; its tall standing Navajo Sandstone domes and fins can be seen from many places along the course. From smooth double […]
Bridge Runner Ultra
Discover the scenic 35-mile loop starting in Canon City, Colorado, tracing along the Arkansas River and through historic Tunnel Drive tunnels. Ascend to 7,109 feet for panoramic views of Royal Gorge and Pikes Peak. Runners navigate pristine singletrack in Royal Gorge Mountain Park, cross the highest US bridge, and descend through Temple Canyon. With only […]
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