Event details subject to change. Please confirm all information via event website.
Week of Events
Sunday, May 3, 2026
-
Featured May 3, 2026 -Featured Colorado Marathon
-
May 3, 2026 -Longmont Half and 5K
-
May 3, 2026 -RMRR Central Park 5M/5K
-
May 3, 2026 -Emerge 5K
-
May 3, 2026 -Frank Shorter Track Classic
-
May 3, 2026 -Hayden Cog Run
-
May 3, 2026 -Best Buddies Friendship Walk
Colorado Marathon
Marathon, Half Marathon, 10k, 5k and 3-Person Marathon Relay. Marathon, Marathon Relay and Half Marathon runners get to run down the scenic, downhill Poudre Canyon to the finish in Old Town, Fort Collins, where we have live music and a big post-race party featuring beer from Odell Brewing Company. For 2027 Boston Marathon qualifiers, races […]
Longmont Half and 5K
Longmont's only Half Marathon - now offered in the cooler month of MAY! Join the Half Marathon or 5k distance! Walkers and Runners of all abilities welcome!
RMRR Central Park 5M/5K
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 […]
Emerge 5K
The Emerge 5K is our biggest annual fundraiser, and the funds we raise ensure that we can continue to fulfill our organizational mission of breaking the social and financial barriers to mental health care for youth. Each year, Rise Against Suicide funds thousands of therapy sessions for youth under the age of 19 who are […]
Frank Shorter Track Classic
The Frank Shorter Track Classic is a track meet honoring one of America's greatest distance athletes. Each year, we will celebrate Frank's career, his devotion to the sport of running and promotion of health and fitness, while also acknowledging a different Boulder Olympian. This year's meet will take place on May 21st at Nevin Platt Middle School in Boulder.
Hayden Cog Run
The Hayden Cog Run is one of the longest consecutively run races of the Steamboat Springs Running Series and in the state of Colorado! This is a Routt County Classic held in the small town of Hayden Colorado 25 minutes west of Steamboat. The Cog Run is a challenging 8.4 mile out and back course […]
Best Buddies Friendship Walk
The Best Buddies Friendship Walk is the leading event in the country supporting inclusion for people with intellectual and developmental disabilities (IDD). Join 50,000 participants at 70+ Walks across the globe to support the Best Buddies programs in schools, workplaces, and communities. You’ll be making the world more welcoming to people with IDD — one […]
Monday, May 4, 2026
No events on this day.
Tuesday, May 5, 2026
-
May 5, 2026Dash and Dine 5K #2
Dash and Dine 5K #2
The 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.
Wednesday, May 6, 2026
No events on this day.
Thursday, May 7, 2026
No events on this day.
Friday, May 8, 2026
No events on this day.
Saturday, May 9, 2026
-
May 9, 2026 -Quad Rock Trail Race
-
May 9, 2026 -Valkyrie Women’s Trail Race
-
May 9, 2026 -CMRA Tucker Lake 6.5
-
May 9, 2026 -Carbon Valley Half Marathon
-
May 9, 2026 -Hometown Half Marathon
-
May 9, 2026 -Miles over the Meadow 5K
-
May 9, 2026 -HRCA Mother’s Day 5K
-
May 9, 2026 -Run for the Trees
-
May 9, 2026 -Walk MS
-
May 9, 2026 -Science Stride 5K
-
May 9, 2026 -Mother’s Day Trail Run
-
May 9, 2026 -Women’s Distance Festival 5K
-
May 9, 2026 -Wine Run 5K
-
Featured May 9, 2026Featured Run to the Shrine
Quad Rock Trail Race
Welcome to the Quad Rock 50 and 25 mile trail races, an event put on by trail runners for trail runners. Taking place on the trails and hills west of Fort Collins in Lory State Park and Horsetooth Mountain Park, the Quad Rock 25/50 will take you on a tour of the Fort Collins skyline, […]
Valkyrie Women’s Trail Race
Valkyrie Trail Race was created as a women only trail/ultra event, featuring Colorado Spring’s, Cheyenne Mountain State Park. The race offers amazing views of the city and a diverse eco-system. We have several different distances available, so everyone in your running group can participate! 50K/Marathon/30K/Half Marathon/8 Mile/4 Mile
CMRA Tucker Lake 6.5
The race will start near the Colorado Tap House parking lot and head west along the Ralston Creek Trail toward Tucker Lake. Once reaching Tucker Lake runners will loop around the lake counterclockwise and then return on the trail back to the start.
Carbon Valley Half Marathon
Colorado at its Best – the Carbon Valley Half Marathon will showcase the beauty & diversity of Colorado’s best kept secret. Small town charm with Big City services, nestled between Denver & Fort Collins, Firestone & Frederick host these 13.1 mile & 5K adventures. Runners will tread upon Mining Town history via manicured trail systems, […]
Hometown Half Marathon
Join us for the annual Hometown Half Marathon & 5k/10k! A run local-themed event that is perfect for the whole family. The fun includes great swag (designer shirt, custom medal), chip-timing, live results and awards, pacers for half marathon free photos, a "biggest team" contest, a kids' dash, great post-race food, and plenty of fun! […]
Miles over the Meadow 5K
Parker Parks and Recreation Run Series invites you to come out and celebrate mom (or anyone) and run or walk 3.1 Miles over the Meadow in this fun filled 5K at Tallman Meadow Park on Mother's Day weekend. If a 5K is a little too much for the family, participate in the Family Fun Trek. […]
HRCA Mother’s Day 5K
Great family-friendly course for 2023! Bring your family and friends and join in the fun at the 8th Annual HRCA Mother’s Day 5K! Sign up the whole family and make it a morning of activity they can all enjoy.
Run for the Trees
We’re helping Parks and Rec celebrate Loveland's Arbor Day. Come enjoy food trucks, live music, and a 2 mile fun run to help raise money for the tree planting fund. Each participant will receive a custom bib, custom swag (TBD), and lots of FUN!
Walk MS
Walk 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 […]
Science Stride 5K
The Friends of the National Center Science Stride 5k brings together our community for a common cause: Inspiring the next generation of scientists! This event provides an excellent opportunity for everyone who believes in the importance of STEM education to come together and support Friends of the National Center. Runners and walkers of all abilities […]
Mother’s Day Trail Run
A new Race Series for Colorado with 2 races over the Weekend for both WOMEN/Moms and their families!....Saturday, MAY 10th, 5k & Family 1 mile in Denver at GREAT LAWN PARK, then on THIS Sunday in LOUISVILLE- COMMUNITY PARK for the 5k, 10k and Family Mile Trail Races. Take your choice. LOUISVILLE- Expo opens at […]
Women’s Distance Festival 5K
The Womens’ Distance Festival is no longer an event for “women only”. This event is now a “community” event, supporting the Girls on the Run® of the Rockies. Girls on the Run is a non-profit organization that uses the power of running to change the way girls ages 8-13 see themselves and their opportunities. Girls […]
Wine Run 5K
Like Running or Walking? Love Wine? This race is for you! Join us for an exciting annual event that features the amazing scenery and landscape of Colterris Winery! With over 75 acres of vineyards, Colterris is Colorado’s largest fully Estate Grown winery and we are proud to be one of Colorado’s wineries whose mission is […]
Run to the Shrine
Join us on Saturday, May 17 or Sunday, May 18, 2025 for Run to the Shrine, Cheyenne Mountain Zoo’s annual fundraiser run/walk. This 4-mile casual run/walk winds through the Zoo and up to Will Rogers Shrine of the Sun, with leopards, lions and elephants along the way. Enjoy stunning views of Colorado Springs below while ascending […]
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.