Found 335 races

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SEP
26

Estes Park, CO
$90 -$265
​Join us for the Estes Epic on September 26-27, 2026 —a premier event featuring a 50k Bike Race, 50k Run, and Heavy Half Marathon. After a six-year hiatus, this challenging race returns, offering...
Half Marathon 50K
39
SEP
26

Littleton, CO
$40 -$65
Put on your lederhosen and sneakers as we kick off the annual HRCA Oktoberfest 5K in Town Center on Saturday, September 26, starting at 9:00 a.m.! Celebrate fall with a family-friendly,...
5K
21
SEP
26

Pagosa Springs, CO
Pagosa Springs High School would like to invite you to participate in our MS and HS XC meet on Saturday, September 27th, 2025. This year, we will be hosting the meet at our traditional location...
19
SEP
26

Fruita, CO
$25 -$35
Fruita Fall Festival - Mesa County Search & Rescue 5K Race HOSTED BY MESA COUNTY SEARCH AND RESCUESUPPORT OUR MISSION TO RESCUE AND SAVE LIVES Race Starting line and Finish is at Fruita Community...
5K
4
SEP
26

Durango, CO
$85 -$100
Have you ever stood at the bottom of a mountain, staring up at the top, thinking to yourself: “I wonder if I could run all the way up there?” Well, now you’re going to find out! The Mountain...
15
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26

Commerce City, CO
$35 -$65
The Night Nation Run is the World’s first Running Music Festival the ultimate blend of a Music Festival and a Fun Run. Experience a music filled course with Live DJs, Bubble Zones, Light Shows,...
27
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26

Colorado Springs, CO
$90 -$120
What Is OUTLAST? OUTLAST is a 6-hour trail endurance challenge where runners complete a 5K every hour, on the hour. Each lap must be finished within the hour to stay in the event. If you finish...
3
SEP
26

Oak Creek, CO
$20 -$25
On Saturday September 26, enjoy the first weekend of fall with a breathtaking workout overlooking the waters of Stagecoach State Park Reservoir then savor warm cider with a delicious stack of...
5K
SEP
26

Broomfield, CO
$25 -$40
RUNWAY 5K: In-Person (Broomfield, CO) and Virtual (Anywhere)! A Benefit Run/Walk for Angel Flight West Join Us to Run for a Cause That Matters! Funds raised will support Angel Flight West and...
5K
12
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26

Westcliffe, CO
$60 -$375
The Human Potential Running Series PresentsThe Sangre de Cristo Trail Festival @ Music Meadows Ranch Come join us on the Rainbow Trail in the Sangre de Cristo mountains. Run beneath the watchful...
27K 50K 100K
136
SEP
26

Buena Vista, CO
$125 -$190
With glorious views of the Collegiate Peaks and 4,000ft of ascent along the way, these 18 or 30 miles of buttery single track and forest roads are perfect for everyone from the first time trail...
30K 50K
1
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27

Buena Vista, CO
$35 -$50
14er Fest is a multi-user trail event held in the fall in Buena Vista, CO. Trail running is a key component of the event, and we offer two unique races as options. In the spirit of "14er" Fest,...
5K 14K
22
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27

Timnath, CO
$15 -$40
Join us for the Race for Joy & Justice 5K, a family-friendly run/walk event benefiting the Joy & Justice organization based in Timnath, Colorado. This exciting event brings together people of all...
1m 5K
26
SEP
27

Boulder, CO
$40 -$500
This is a virtual race open to supporters across the country who want to take action for children and families. Participants can run, walk, or move in their own community while supporting a...
5K 10K Half Marathon
17
OCT
3

Westminster, CO
$40 -$48
Hi Friends of Big Waves! We are looking forward to having everyone back for our family 5k this year! Please reach out if you have any questions that you don't see the answers for here. My email...
5K
10
OCT
3

Colorado Springs, CO
$8 -$500
Come celebrate the 13th Annual Colorado Springs Marathon Saturday, October 3, 2026!  Whether you are a seasoned runner or looking to tackle your first 5k, we have you covered with 4 events to...
5K Half Marathon Marathon
52
OCT
3

Steamboat Springs, CO
$25 -$50
This race will serve as the end of the SSRS pointed season where series winners will be announced. Please be present to pick up awards. This race is a fundraiser for the Boys & Girls Club.  This...
4m 12K
47
OCT
3

Fort Collins, CO
$25 -$50
Saturday, October 3rd at 8:00 am Join fellow Rams and CSU friends for the 46th annual Homecoming 5K! The race is a great way for community, alumni, and students to come together for fun, fitness,...
5K
13
OCT
3

Littleton, CO
$10 -$80
The Wildcat Mountain Trail Races showcase some of the most scenic terrain in the HRCA Backcountry Wilderness Area, giving runners a true taste of the rolling hills, open views, and natural beauty...
10K
14
OCT
3

Thornton, CO
You CAN 5k.  This event is for EVERY ONE.  EVERY BODY.  You won't get lost.  You won't get forgotten.  You'll run (or jog or walk or crawl) a clearly marked 5k course with friendly volunteers...
5K
29