Event details subject to change. Please confirm all information via event website.
Know. Grow. GO RUN. 5K
Come and GO RUN or walk our new cross country trail on campus.
Ram Party Trail Runs
With plenty of race options for everybody centered around the beautiful Rampart Reservoir in Woodland Park, Colorado, you're sure to have a good time while you take in the epic views of Pikes Peak and the front range. 55 Mile | 60K | 50K | 24K | 15K
Dog Jog 5K
The Dog Jog 5k is back and better than ever! Join the pack and run for a cause. This dog friendly 5k welcomes runners and walkers of all ages (even in dog years!) with the goal of raising funds for the pets and programs of the Cheyenne Animal Shelter.
Black Canyon Ascent
The Black Canyon Ascent 6-mile Run and Challenge Walk features a tough, scenic course starting at an elevation of 6500' and climbing almost 2,000' to the rim of the Black Canyon National Park. First run in 1977! For over 40 years, beautiful vistas and scenic surroundings have inspired people to challenge themselves and the competition in […]
Endure Trail Runs
The Endure 12-Hour is a one-of-a-kind challenging 12-Hour timed event, designed by YOU… and tiny colorful balls. Each runner will pull colored balls from a bucket, which determines the loop they’ll next run. This continues for up to 12-hours in time, and the runner’s result is the number of miles they ran within the allotted time. […]
Memorial Day Run and March
Special Forces Foundation is proud to announce the Annual Memorial Day Run & March. Be a part of the LARGEST food donation event in Colorado! The Memorial Day Run & March invites civilians, Veterans, and uniformed Military to challenge themselves in friendly competition while helping feed homeless Veterans. We have three category events to choose from […]
Tour de Victory
Join the Tour de Victory Cycling Challenge, Colorado’s premier Parkinson’s bike ride benefiting the Davis Phinney Foundation. This boutique bike ride is an opportunity to join the Davis Phinney Foundation’s inspiring community and make a positive impact on the lives of people with Parkinson's. Select your preferred route (100k, 50k, or 20k) and ride any bike you like: road bikes, e-bikes, recumbents, trikes, and more are all […]
Boneyard Boogie Trail Run
Eagle Pool and Ice Rink 1700 Bull Pasture Road, Eagle, CO, United StatesThe Boneyard Boogie kicks off the 2025 Vail Trail Running Series with a 14K or 6K scamper through pinyon groves and juniper shrubs on some of Eagle's most scenic single track trails, with an elevation gain of 1,279 feet, reaching a maximum elevation of 7,718 feet. Both races will start and end at the Eagle […]
Vallecito Lake Heavy Half
The Vallecito Lake Heavy Half Marathon is a beautiful and scenic course around Vallecito Lake. Nestled in the heart of the San Juan Mountains in Colorado, our race course takes runners completely around the picturesque Vallecito Reservoir with a special section that runs right across Vallecito Dam. If you ever wanted to run all the […]
Spirit Challenge
Steamboat Springs Middle School 5100 Amethyst Drive, Steamboat Springs, CO, United StatesThe Spirit Challenge Run for Autism offers three different distances, a 10k, 5k and Kid’s Fun Run. All races are on paved roads, except for the 5k which has a short section on trail. The Kid’s Fun Run is an 800m run consisting of 2 laps around the Steamboat Springs Middle School track. The Spirit […]
Gluten Free Gallop
Join Denver Celiacs to raise awareness of celiac disease and all gluten-related disorders. Our 13th Annual Gluten Free Gallop 5K will take place at Clement Park in Littleton, CO, on Saturday, May 16, 2026, from 9:00 AM-12:00 PM. This year we will also be offering our very popular ROCK Fun Run again! This is a […]
Ouray Backyard Ultra
A Backyard Ultra. Complete an easy 4.167 mile course. If you finish in less than an hour—just a 14:24 pace per mile—you get to do it again at the top of the hour. The race continues hour after hour until there is only one person left. To secure the win, that person must successfully complete […]
Colfax 5K
Come run City Park in the Colfax 5K! Go for a PR in this chip-timed race – separate stroller-friendly start wave for families and walkers. And, you can run with your dog in the dog wave presented by Evolution Veterinary Specialists! Afterparty with live music. A great chance to be a part of Marathon weekend […]
Walk MS
Acacia Park 115 E Platte Ave, Colorado Springs, CO, United StatesWalk MS includes a powerful new experience where you’ll witness how your support changes the lives of people with MS and gets us closer to our ultimate goal: a cure. Whether you live with MS, love someone who does, or are a part of the wider community, you can proudly display your role in the […]
Stem Ciders at Acreage 5K
Acreage by Stem Ciders 1380 Horizon Avenue, Lafayette, CO, United StatesJoin us for the Stem Ciders at Acreage 5k, and great, local craft cider in Lafayette on May 16, 2025 Join us for the Stem Ciders at Acreage 5k on May 16, 2025, for a 5k-ish, fun run event that starts and ends at this awesome cidery in Lafayette. Run, walk, jog - whatever goes! […]
Colfax Marathon
New for our 20th Year! “WOW” at Every Mile To celebrate our 20th, every mile will have a WOW for runners. That moment every mile that gives you that WOW and extra energy for the miles to come. We are inviting local musicians, artisans, drumlines, choirs, … to be part of our WOW for our […]
Wild Horse Half Marathon
Set against the breathtaking backdrop of the luxurious High Lonesome Ranch, this isn’t just a race—it’s a full weekend of adventure and celebration! Runners will enjoy a country cookout, campfires, live local music, and camping accommodations. It’s the perfect blend of rugged terrain and western hospitality, complete with a lively hoedown to round out the weekend. […]
Mt Sopris Run-Off
The Mt Sopris Run-Off takes place in Carbondale, CO and offers two distances – 10-Miles and 28k. Historically this race has been a part of the Town of Carbondale’s Mountain Fair Weekend in late July. In 2026, the race will take place on Sunday, May 17th as part of a growing trail running festival weekend […]
Miles for Smiles 5K
The Miles for Smiles 5K is a friendly event that begins and ends on the track at the North Area Athletic Complex (NAAC) in Arvada with a scenic trek along the Fairmount Trail in the middle. Join Right Start Events on May 15th, 2022 for this 5K and Adaptive Dash.
Canine On the Creek 5K
Gather your family and friends, including your furry friends—don't forget Fido! Grab your running (or walking) shoes and join us in supporting FOCP (Friends of Charlie's Place), the Clear Creek and Gilpin County Animal Shelter, and CCMRD Youth Programs. The exciting course takes you through both paved and dirt trails along the picturesque Clear Creek. […]
Dash and Dine 5K #4
Boulder Reservoir 5565 N 51st St, Boulder, CO, United StatesThe Dash & Dine 5k run, Boulder’s favorite spring tune-up run series is back for 4 races in May at the beautiful Boulder Reservoir in Boulder, CO.
Turquoise Lake 20K
The Turquoise Lake 20K offers unparalleled mountain views as you run clockwise around scenic Turquoise Lake. The first 7.5 miles of the course consists of hilly paved road. The final 5.5 miles consist of single track dirt trail.
Farish Trail Race
Date: May 23, 2026 Location: Farish Recreation Area at 12005 Rampart Range Rd Woodland Park, CO 80863 Start times: 7:00 am – 8:00 am Distance: Half Marathon, 10K, 5K 1 Mile Kids Fun Run (Free) Prizes: Top 3 Male and Female in the Half, 10K, and 5K First 200 Finishers Receive a limited edition race […]
Samson’s Revenge Trail Race
Samson was the celebrity elk of the Rockies until he was illegally poached in 1995 on YMCA grounds. Our race runs on Samson's home turf, The YMCA of the Rockies, which his descendants still call home. The course is fast single track with a big King of the Mountain challenge slapped in the middle. This […]
Mile High Mile
The Mile High Mile Saturday, May 23 | Boulder High School The Mile High Mile is back for its 8th season—bringing a high-energy night of racing to Boulder for runners of all ages and abilities right at the heart of the Boulder Creek Festival and all the excitement of Memorial Day weekend in Downtown Boulder. […]
Narrow Gauge 10 Mile
Since 1978 the Narrow Gauge 10 Mile Run has been one of Durango’s oldest Memorial Day traditions. The 10-mile course showcases the Fort Lewis College rim, the Animas River Trail and great views of Durango! This is the longest continuously run road race in Colorado. In 2021, even with COVID, we had a temporary race […]
BolderBoulder 10K
We’re not sure when or how it happened, but somewhere along the way our little run in Boulder, CO turned into an event of epic proportions. We like to think it’s part race, run, jog, walk, parade, celebration and tribute. We made it for everyone.
Angel Run
Please join us on Memorial Day for the 5th Annual Angel Run in support of the local, veteran-owned 501c3 non-profit organization, Angels of America's Fallen! Gather at Red Leg Brewing for the in-person 10k and 5k run/walk or participate virtually. All proceeds of the event will be donated to Angels of America's Fallen to help […]
Memorial Day 5K
Join us for our Memorial Day 5K Fun Run & Walk at Imperial Memorial Gardens Cemetery and Funeral Home, honoring our fallen heroes while supporting victims of domestic violence. Registration is absolutely free, and all we ask is that you bring a donation of clothing or other items to support victims of domestic violence. If […]
Pyro’s River Trail Run
Honor our fallen hero and all those who have paid the ultimate sacrifice for our freedoms on Memorial Day. Choose to run the family friendly 3.5K along the beautiful Colorado River or challenge yourself on the 7.7K up the scenic mountainside then returning to the river valley. Following the race stay for the barbecue and […]
Please click here to submit your event for FREE to our online calendar.
We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.