Found 307 races

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Connect with runners, find training partners, and celebrate every finish together

SEP
12

Denver, CO
• 65.9 miles
$44 -$60
The Denver 5k in Denver, CO - family-friendly community race featuring great community spirit and atmosphere
5K
574
SEP
12

Buena Vista, CO
• 44.9 miles
$65 -$100
A Half Marathon and 10K that twist and turn through sage brush and ponderosa pines, all while providing stunning views of the prestige Collegiate Peaks. Located in the Rocky Mountains along the...
10K Half Marathon
34
SEP
13

Denver, CO
• 70.7 miles
$20 -$51
The 9/11 Heroes Run 5K welcomes runners, ruckers, and walkers of all ages and fitness levels to honor the heroes of 9/11 and those who've served our nations since. We activate & unite communities...
5K
26
SEP
13

Palmer Lake, CO
• 72.5 miles
$35
Join us on Sunday, September 14, 2025, at Palmer Lake Regional Recreation Area for the 7th Annual Colorado Run for the Fallen—an up to 6-hour untimed run/walk/ruck hosted by the Honor and...
5
SEP
13

Loveland, CO
• 85.2 miles
$15 -$30
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....
24
SEP
13

Thornton, CO
• 71.6 miles
$10 -$15
Rocky Mountain Road Runners holds a monthly Trophy Series in the Denver area.  We provide a low-key, low-cost racing environment. Everyone is welcome to run with us! The 10km race uses a handicap...
5K 10K
54
SEP
18

Severance, CO
• 99.5 miles
$35 -$45
Unique nighttime glow-themed 5K run/walk in Severance, CO during Severance Days festival. Professionally timed with DJ entertainment and post-race party.
5K
269
SEP
19

Colorado Springs, CO
• 83.6 miles
$25
All Hands on Deck Pirates 5K in Colorado Springs. Register now for this exciting running event.
5K
70
SEP
19

Westminster, CO
• 64.7 miles
$25 -$85
One of Colorado's favorite trails meets one of its most glorious parks at our 9th annual Fallfest! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with...
5K 10K Half Marathon
305
SEP
19

Buena Vista, CO
• 62.3 miles
$30 -$100
Annual run in Buena Vista with supportive community atmosphere and race day excitement
5K 10K Half Marathon
264
SEP
19

Beulah, CO
• 117.1 miles
$20 -$205
RACE START TIMES: 1/2 Marathon - 8:00 a.m.10K - 9:00 a.m.5K - 9:15 a.m. The Beulah Challenge, which started in 1996, is a 5K, 10K, and half-marathon run near Beulah, a small southern Colorado...
5K 10K Half Marathon
13
SEP
19

Denver, CO
• 63.6 miles
$25 -$40
Come join us for a fantastic day to celebrate inclusion and community! We welcome all levels of participants and we welcome all people- this is a no sorry zone.  This event is our largest...
5K
14
SEP
19

Brighton, CO
• 75.7 miles
$30
9th Annual GUMMBALL 5K - In Honor of Fallen Deputy Heath Gumm The Gummball 5K will be run in honor of our fallen brother, Deputy Heath Gumm. He paid the ultimate sacrifice on January 24, 2018. ...
5K
1
SEP
19

Red Feather Lakes, CO
• 95.8 miles
$35
The Tavern at Red Feather Lakes is planning this year's Oktoberfest on Saturday, September 19th. As a part of the festivities, Caring Hearts of Red Feather Lakes Foundation is putting on our...
12
SEP
19

Littleton, CO
• 62.6 miles
$25 -$35
Miles 4 Madison is a 5K/1K Fun Run supported by Sterling Ranch CAB. Miles 4 Madison's goal is to provide educational and recreational opportunities for families with children with different...
1K 5K
15
SEP
19

Manitou Springs, CO
• 12.1 miles
$200 -$225
13.32 miles and 7,867ft of elevation gain.   From Manitou Springs to the summit of Pikes Peak. This is not your average half marathon, it is a challenge unlike any other!  
35
SEP
19

Wellington, CO
• 104.4 miles
$15 -$65
Wellington STAR Foundation 5K & 10K @ Centennial ParkEnjoy warm late-summer sunshine as you run through the welcoming streets of Wellington, Colorado. With wide-open views, small-town charm, and...
5K 10K
18
SEP
20

Pueblo, CO
• 39.1 miles
$35 -$50
Southern Colorado Runners welcomes you to the revived Chile & Frijole Hot to Trot Race Sunday, September 20, 2026 @ 8AM. The Chile & Frijole Hot to Trot Race will be held on the last day of the...
5K 10K
10
SEP
20

Pueblo, CO
• 39.1 miles
$35 -$50
Southern Colorado Runners welcomes you to the revived Chile & Frijole Hot to Trot Race Sunday, September 20, 2026 @ 8AM. The Chile & Frijole Hot to Trot Race will be held on the last day of the...
5K 10K
10
SEP
20

Wheat Ridge, CO
• 60.3 miles
$10 -$30
The Farmers 5000 is likely one of the very first school-based 5K fundraisers in the state of Colorado. Since 1981, serious racers and weekend warriors alike have been coming to Wheat Ridge High...
5K
39