Found 297 races

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AUG
4

Fort Collins, CO
• 83.7 miles
$25 -$30
Join us August 5, 12, 19 & 26 for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their...
5K
21
AUG
6

Boulder, CO
• 8.5 miles
$20
NO Race Day Registrations Fun for all, from newcomers of any age racing for the first time to veteran competitors looking to test their fitness, all in a friendly, welcoming environment. Held at...
1m
9
AUG
6

Eldorado Springs, CO
• 11.8 miles
$30
Founded in 1979, the Eldorado Run for the Cure is the longest operating charitable footrace in the State of Colorado. All proceeds from the annual four-mile run benefit the Colorado Cancer...
12
AUG
7

Fort Collins, CO
• 86.4 miles
$26 -$110
Friday, August 7th, 2026 Jane Welzel Mountain Ave Mile Faster than Flat - point-to-point, slightly downhill mile on Mountain Avenue in Fort Collins, CO. Featuring multiple race waves:  Mountain...
5K 10K Half Marathon
14
AUG
7

Centennial, CO
• 40.0 miles
$10 -$15
August may be hot...but still a great time to run, and we hope you'll come join the runners of RMRR. We'll run our August 5k on the Highline Canal around DeKoevend Park.  As always, everyone is...
5K
76
AUG
8

Arvada, CO
• 21.3 miles
$40 -$353
12th annual end-of-summer celebration on Ralston Creek Trail with Half Marathon, 10K, and 5K distances. Official BOLDERBoulder qualifier supporting veterans.
5K 10K Half Marathon
193
AUG
8

Centennial, CO
• 41.2 miles
$27 -$40
Run. Support. Celebrate.Join us for the 7th Annual Arapahoe Warrior 5K and support the Arapahoe Warrior Cross Country Team! With $10 from every registration going directly to the Arapahoe Cross...
5K
61
AUG
8

Longmont, CO
• 21.2 miles
$20 -$45
Come join us on August 8, 20226  for a race around the entirety of beautiful Lake McIntosh! This 3.5 mile race is a half paved/half dirt course surrounded by wonderful mountain views, vast...
10
AUG
8

Berthoud, CO
• 104.0 miles
$5 -$75
Eat. Run. Adopt. Join us for Berthoud’s first-ever community-driven 10k!  In partnership with Berthoud Pet Supply, this isn’t just a race—it’s a moving feast with a mission. A portion of race...
10K
35
AUG
8

Colorado Springs, CO
• 84.1 miles
$65 -$90
Join us and "Race for the horseshoe!" Starting August 8, 2026 we will be bringing back the historic Pony Express race. Now with a new annual race weekend, the second Saturday of August, we honor...
8m 16m
4
AUG
8

Woodland Park, CO
• 77.1 miles
$65 -$90
Join us and "Race for the horseshoe!" Starting August 8, 2026 we will be bringing back the historic Pony Express race. Now with a new annual race weekend, the second Saturday of August, we honor...
8m 16m
3
AUG
8

Thornton, CO
• 25.5 miles
$17 -$48
Join us for the annual Summer Sizzler 5k/10k/15k!  A fun summer event that is perfect for the whole family. The fun includes - Great Swag - designer shirt & custom medal Chip-timing with live...
1m 5K 10K 15K
286
AUG
9

Leadville, CO
• 75.9 miles
$65 -$80
Leadville Boom Days International Pack Burro RaceHauling Ass for Over 70 Years Step back into the grit and glory of the Old West at the legendary Leadville Boom Days International Pack Burro...
12
AUG
9

Littleton, CO
• 38.2 miles
$20 -$25
Work up an appetite for a deluxe breakfast at the Pancake Stampede 5K! The race is a part of Littleton's Western Welcome Week celebration, and is held before the annual pancake breakfast at...
5K
4
AUG
9

Colorado Springs, CO
• 91.8 miles
$17 -$47
Family-friendly multi-distance race at scenic Cottonwood Creek Park featuring Beach Party water stations, free Kona Ice, and beautiful Pikes Peak views.
1m 5K 10K 15K
176
AUG
9

Lakewood, CO
• 30.1 miles
$25 -$50
                                               Run the Race. Stay for the Party. 
5K
3
AUG
11

Bellvue, CO
• 82.0 miles
$25 -$30
Join us August 5, 12, 19 & 26 for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their...
10K
20
AUG
15

Centennial, CO
• 46.2 miles
$30 -$45
🥯🏃‍♂️ Run for the carbs. Stay for the bagels.Love running? Love bagels? This one’s for you.Whether you’re chasing a workout or just here for the carbs, this run is all about balance, fun, and...
1m 5K 10K Half Marathon
27
AUG
15

Denver, CO
• 36.1 miles
Miles for Migraine will host its 6th annual 2-mile Walk, 5K Run and Relax Denver Event at Great Lawn Park. This event is a fundraiser for Migraine & Headache Awareness, Treatment & Research....
2m 5K
19
AUG
15

Longmont, CO
• 15.4 miles
$10 -$40
The Sunrise Stampede 5K and 1-Mile Fun Run/Walk is a community celebration that brings together neighbors, schools, students, families, educators, local businesses, and supporters from across St....
1m 5K
4