Swim a 10K, 2.4 miles, 1.2 miles, 1000 meters, or 250 meters in the Horsetooth Reservoir.  The Horsetooth Open Water Swims incorporated as an independent 501(c)3 not-for-profit organization.  Our current beneficiary is Partners Mentoring Youth.

RMRR’s Marathon Training Series provides 10M and 20M races that are low cost, friendly, fully supported, and officially timed.  All you need to do is focus on your running!  Our races fit perfectly in training schedules for Colfax, Boston, New York, Chicago, and other full and half marathons. Everyone is welcome at our MTS races:  RMRR members, […]

We welcome you to our 17th annual youth triathlon! Tri the Rock is designed for, and open to youth ages 5 to 18. Come for a great day of fun, food, prizes and sport! Age division participants for Tri the Rock compete based on age on RACE DAY. Be sure to register and prepare accordingly. Race […]

Everyone – slow, fast, or in-between –  can win  at RMRR Trophy Series races.  With our handicap scoring system, we predict YOUR finish time based on recent running results, giving you a great goal to shoot for whatever your speed.  Just show up an hour before the start and we’ll get you ready for your race.  It’s an […]

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.

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 […]

The Flyin' Lion 5K returns this year to raise money to support Littleton High School’s Lions Sports Booster Club, a non-profit 501c3 made up of parent volunteers and school administrators. The race will take place at Littleton High School on October 2nd, 2022.

Are you ready to challenge yourself? We will have a 1-mile loop open for 1 ½ hrs. Who can run the most loops in 1 ½ hrs? Who can run the fastest? We will have awards for different categories. Come challenge yourself at the Honey Festival while running the Honey Bee Challenge! There will be […]

Join Conservation Colorado for the first-ever Rebel Run 5k! Run, walk or stroll to show your passion for Colorado's climate, air, land, water and communities. Create or join a team, or go solo – every dollar you donate or raise supports Conservation Colorado's efforts to protect the beautiful state we love and the communities who […]

The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against others in-person on Wednesday evenings, or run the marked course on their own Tuesday-Thursday weekly for a virtual option.

Join us at the YMCA of the Rockies in Granby for the 12th annual Snow Mountain Ranch Trail Running Festival. This event features 4 races with 2 different "challenges".  Races will include a 50K, 33K, Half Marathon,10K and 5K. Challenge yourself with our popular "Moosehead Challenge" and "Baby Moose Challenge" by completing multiple events in […]

The course will be on wide, crushed gravel paths and, depending on the status of construction in the nearby neighborhood, potentially a little bit of single track. It's a hilly, but very run-able course, a few ups and downs during this 7 mile course! We'll travel "the wrong way" around the standard Bluffs route before […]

One of Colorado's favorite trails meets one of its most glorious parks at our 9th annual Fallfest 5K, 10K and half marathon! As the courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into view. A course that's not too hilly & […]

Embark on your journey by winding through Old Town Nederland, the epitome of Colorado mountain towns. The Half Marathon, 10K and 5K will take you on dirt roads and single track trails as you challenge yourself to be “a little more extreme“ and immerse yourself in the history and beauty of the area. This long-time […]

The Rocky Mountain Chapter of the Huntington’s Disease Society of America (HDSA) will host the the annual Heroes and Villains Team Hope 5K Walk and Run, on Saturday, September 13th at Stapelton Central Park. Registration starts at 8:00 AM and the event starts at 9:00 AM. All proceeds support HDSA’s mission to improve the lives […]

Part of the Parker Parks and Recreation Run Series, this event is professionally timed. Registered participants will receive a race shirt, custom bib and a delicious post-race pancake breakfast. The FREE Kids' Dash follows the race for children 8 and under; no registration necessary. Any proceeds from the event will benefit the Town of Parker […]

This race is epic! Bergen Peak runners will endure the rolling hills of Elk Meadow and the strenuous switchbacks of Bergen Peak and Too Long Trail. While ascending approximately 1,500 feet, runners will peak at a total elevation of 9,000 feet as they cover this 13.1 mile course. Participants should meet at the Buchanan Park […]

Come run a Half Marathon or our new 10k that twist and turn through sage brush and ponderosa pines, all while providing stunning views of the Collegiate Peaks. Located in the Rocky Mountains along the roaring Arkansas River. Trail Sisters was founded on the ethos of empowering women to participate in trail running. There is […]

Take the roads of the RiNo Art District this fall for a fun run or walk through Denver’s most vibrant neighborhood. Sign up for the 5K or 1 mile, or both, and explore the amazing street art during a morning of community, exciting races and positive vibes!

Join us for the annual Spooky Sprint 5k/10k & Half Marathon! A fun, Halloween-themed event that is perfect for the whole family.

Join the Cheyenne Regional Medical Center Foundation for this scenic trail run/walk at the Terry Bison Ranch. Distances include a half marathon, 10K, 5K and 2K. The terrain includes gentle rolling prairie pasture, a short rocky hill we refer to as “The Terry Bison Incline”, and buffalo trails. This scenic course is at times challenging […]

Blisters & Brews is a 5k Fundraiser Race on the morning of Saturday, September 14, giving Festival attendees the opportunity to exercise before the Festival. Presented by the Telluride Blues Society, the 5k Race will raise money for the Telluride Adaptive Sports Program in remembrance of dear festival friend Felix Snow. Through registration fees, donations […]

THE Denver 5k! Denver's Iconic Sloan Lake is the setting for the return of 'THE Denver 5k'. Celebrate with friends and family as you race around the lake in the shadow of Denver's skyline. Group pricing applies; youth and senior pricing are offered as well! Held at the start of September, THE Denver 5k is […]

There's No Way They Grew Lettuce Here! The seventh and final race in the Vail Recreation District's Vail Trail Running Series, the MeadowGold 11K & 5K is presented by Town of Minturn. This exciting and remote route will take place on Meadow Mountain in Minturn, Colorado. Traverse across this beautiful and historic mountain meadow and soak in the […]

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.

Join us for this family-friendly event! The 5K run/walk will begin and end on Elizabeth’s historic Main Street, featuring a new and exciting course that crosses the reconstructed trail bridge and heads north into Evans Park, with a mix of pavement and dirt for varied terrain. The Family Color Run will take place in Running […]

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 […]

Come join us to celebrate the access/disability community and raise money for spinal cord injury rehabilitation and awareness. My name is Kenny White III. On November 15 of last year, I suffered a Burst fracture to my C6 vertebrae. After emergency surgery I woke up a quadriplegic. After months of rehabilitation and hard work, by […]

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! […]

Join us for the Waldschänke Ciders 5k on September 13, 2025, for a 5k-ish, fun run event that starts and ends at this awesome cidery in Denver. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft cider at the finish line. Start windows will be available […]

Welcome to the annual Greenland Open Space Pack Burro Races presented by Double Rainbow Ranch! Grab your burro and join us for a fun and rewarding day on the majestic Greenland Open Space Trail in beautiful Larkspur, Colorado. RACE RULES Each entrant will pay a fee as determined by the Race Director for each race. […]

Lace up your shoes and join us for the Demon Dash at its new course at the NAAC! We're excited to bring this course its new home and onto dirt! Whether you are a runner or walker, this will be a fun community event for all. This year's race will follow the high school races […]

Looking to run the fastest mile you possibly can? Dropping 220 feet, the Flying Falcon Downhill Mile will allow you to run the absolute fastest mile possible. Taking place on the beautiful campus of the US Air Force Academy, the race will start at the top of Academy Dr. near Doolittle Hall and will finish […]

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 […]