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SEP
13

Palmer Lake, CO
• 70.9 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
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13

Loveland, CO
• 25.9 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
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13

Thornton, CO
• 27.7 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
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18

Severance, CO
• 40.1 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
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19

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

Westminster, CO
• 21.3 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
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19

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

Denver, CO
• 27.4 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
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19

Brighton, CO
• 28.5 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
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19

Red Feather Lakes, CO
• 50.5 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
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19

Littleton, CO
• 37.9 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
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19

Manitou Springs, CO
• 88.5 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
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19

Wellington, CO
• 46.8 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
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20

Cheyenne, WY
• 82.5 miles
$30
Grab your leash, lace up your running shoes, and join us May 16, 2026, for the Dog Jog 5K, a tail-wagging, dog-friendly race to support the Cheyenne Animal Shelter! Whether you’re a seasoned...
5K
58
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20

Wheat Ridge, CO
• 26.7 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
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20

Manitou Springs, CO
• 88.5 miles
$225 -$250
The 71st Annual Pikes Peak Marathon 26.2 miles with 7,834ft of elevation gain (and loss).From Manitou Springs to the summit of Pikes Peak and then back again.This is not your average marathon, it...
Marathon
64
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23

Winter Park, CO
• 24.9 miles
$150 -$400
CG Adventure Trip – Mountain ExperienceThis event is a guided CG adventure weekend designed to combine structured training, accountability, community, and an elevated mountain experience....
14
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26

Estes Park, CO
• 20.6 miles
$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
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26

Littleton, CO
• 42.3 miles
$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
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26

Commerce City, CO
• 32.1 miles
$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