Built to showcase the stunning beauty of the Sawatch Range, this high alpine and vert-heavy 50K will challenge and inspire you in equal measure! From starting under the shadow of Mount Princeton and the endless miles of buttery, aspen shaded Colorado Trail singletrack, to the awe-inspiring high point of 13,150ft and panoramic views of Colorado’s highest range, you will get to experience the wonders of the Sawatch over 33 miles and 7,000ft of vertical gain.

Run one of the fastest-growing, top-rated marathons in the country! After nearly tripling in size and selling out last year, Boulderthon has instituted a new 5,000 runner cap and is expected to sell out again this year. Run a 5k, 10k, Half, or Full, at the foothills of the Rockies, in the stunning running mecca […]

Yes! I want ONE MORE adventure!! Escape to the lake! The Last Call Triathlon will be an event you’ll look forward to all season long. Why? Beautiful mountain views, great weather and a family fun venue! Did we mention camping? Yup! There’s that too. Sitting on the east side of Loveland and southeast of Fort Collins, […]

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: […]

The Colorado Domestic Duck Rescue 5k Run to Rescue is a untimed fun run or walk to support the rescue and homing of domestic ducks dumped by their owners into environments where they will not survive. The run, to be held Sept. 28, 2025 at 9 a.m., supports education efforts to build awareness concerning proper […]

Join us for the annual Colorado Coyotes Cross Country Invitational. This meet is open to all youth runners between the ages of 6-14 years old. The course is a mix of mostly grass and crushed dirt rock with a few sidewalk crossings and a few hills. The Invitational will be professionally chip timed by Colorado […]

Join us for WWE's Annual 'Run with the Wolves'! Run with the Wolves is a 5k Run and 1k Fun Run/Walk that raises money for West Woods Elementary PTSA. It is a positive, healthy community event that gets your blood pumping while supporting your school. All proceeds from the race are granted back to the […]

Yes…you read that right, 14er Fest is hosting a 14K Race! This is our unique version of a more competitive and challenging race/trail run! You will begin with most of our 5k course that winds you through the Buena Vista River Park. Once through the River Park you will cross the Arkansas River bridge and […]

Lions Roar 5K is a family friendly 5K to support Leawood Elementary School PTSA!  We welcome all ages and abilities.  Our race takes place at beautiful Clement Park in Littleton, Colorado, which is right in our neighborhood. Money earned at this race will go towards technology fees for our students' Chromebooks, school beautification and our […]

The Fastest Growing (and shortest)  Running Event in CO is back!!! Awake the Lake will hold its 8th Annual PALMER LAKE .5K (Yes “Point” 5), and it just keeps getting better.  The “run for everyone” is a challenging entire ½ kilometer, where competitors are rewarded not only with the unique views of beautiful Palmer Lake, […]

Start your day with fresh air, movement, and unbeatable views at the AAP Friends of Children Fund 5K Fun Run & Walk! Set against the stunning backdrop of Sloan’s Lake Park, participants will enjoy a scenic route featuring sparkling lake views, majestic mountain peaks, and the city skyline in one picturesque loop. Whether you’re running […]

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 […]

Join us for the inaugural Flyin' Ryan Memorial 5k , a heartfelt event dedicated to honoring the memory of Ryan Vomacka, an exceptional athlete and individual who left an indelible mark on our community. Ryan, a Mountain View High School graduate, was an integral part of the Cross Country and Track teams, helping lead the […]

Started in 2004 as a fall companion to the popular Canyonlands Half Marathon, Arches Half Marathon has hosted many runners on the road course. In 2021, Arches became a trail event. The new course features beautiful red rock formations, views of the snow covered La Sal Mountains and the awe inspiring Behind the Rocks Wilderness […]

Experience the amazing Colorado fall colors, fast and flowing singletrack of Rampart Reservoir and the spectacular sweeping views of America’s Mountain, Pikes Peak, in the inaugural Above the Clouds Ultra!

The West Elk Challenge is a trail marathon during the peak of fall colors. Racers will start on the shores of Crawford Reservoir State Park and travel on gravel roads through the farms and ranches at the base of the iconic Needle Rock. Soon thereafter, the trail enters the Gunnison National Forest and begins climbing […]

Welcome to the Town of Castle Rock’s epic trail event. Come to challenge yourself on the vast ridgeline trail system and enjoy Castle Rock’s local trails. Trail run options range from the liveBIG 5K to the Ultra Marathon 50K. If you’ve run this trail system before, you know these are some beautiful and beguiling trails. […]

Get ready for a ROYALly GORGEous experience! Whether you’re tackling the 5K, the 8-mile trail run, or the half marathon trail run, this event offers something truly special. All three races feature the exhilarating opportunity to run across America’s highest suspension bridge, the iconic Royal Gorge Bridge, with breathtaking views of one of Colorado’s most […]

Join us for the Not So Flatt Breast Cancer Awareness Walk and Run.  In 2021, my father lost his fight against breast cancer so we have put together an annual race in his name to support everyone who has fought and is still fighting breast cancer.  His last name was Flatt and his battle wasn't […]

Hi Friends of Big Waves! We are looking forward to having everyone back for our family 5k this year! We are going to do a superhero theme, so come dressed as your favorite good-doer! We will be back at Lifetime Fitness in Westminster (off 144th an I-25). Please reach out if you have any questions […]

10 or 19 mile trail runs at the height of fall colors in Crested Butte.  Fun prizes to winners and random participants. https://www.cbmountainrunners.org

Race Format The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is calculated using an algorithm developed by Bob Royse, and it's geared to favor a beginning runner and the slower runners. Click here for an explanation of the […]

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 […]

Prospect Ridge Academy is thrilled to present our Annual Miner Gold Rush and Fall Festival! All proceeds will benefit Prospect Ridge Academy, a public charter school providing a rigorous, quality K-12 education with an intensified math and science focus. Help support the school while having fun in this exciting community event!

Celebrate a summer of fund-racing with us at Paws In The Park 5k Race and Pet Walk! Enjoy live music, breakfast, and mimosas. See you there!

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 […]

Join Parker Recreation and Square Peg Therapies for our annual RunAbilities FUN Walk/Run/Roll! The two-mile, fully accessible course begins at Cottonwood Park and on to the Cherry Creek Trail.

5K DETAILS: The 5K features a chip-timed race designed to show the beauty of the neighborhoods by Kinard Middle School.  Enjoy the music along the course provided by the Kinard and Fossil Ridge bands. REVERSE PARADE/FUN RUN DETAILS: Perfect for young children and non-runners, the Reverse Parade is a Fun Run in which participants will […]

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 […]