Found 156 races

🎉 Join Your Local Running Community!

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

JUL
6

Boulder, CO
• 39.3 miles
Nestled 5,430 feet above sea level, Boulder, Colorado is renowned as the heart of the running world, home to Olympic athletes and elite runners alike. This summer, experience the ultimate...
16
JUL
9

Boulder, CO
• 38.7 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. We are...
1m
9
JUL
11

Westminster, CO
• 41.4 miles
$35 -$85
Get ready for a sun-soaked adventure and a fantastic mid-season challenge with our 13th Annual Dog Days 5K, 10K & Half Marathon, benefiting Do Over Dogs! Held in a central location between Denver...
5K 10K Half Marathon
173
JUL
11

Denver, CO
• 49.4 miles
$33 -$40
Cookie Chase in Denver, CO - annual community running event featuring great community spirit and atmosphere
5K
40
JUL
11

Denver, CO
• 49.0 miles
$10 -$35
Move your way. Connect in community. Support health—body and mind. Join the Denver-Rocky Mountain Association of Black Psychologists for the DRMABPsi 1–5K Walk, Run & Roll, an inclusive,...
1K 2K 3K 4K 5K
8
JUL
18

Denver, CO
• 49.5 miles
$35
Join OCA Colorado for the annual 5K Panda Run & 1K Walk, a fun-filled community event with a powerful purpose: helping local Asian Pacific American (APA) students pursue higher education right...
1K 5K
6
JUL
18

Aurora, CO
• 47.4 miles
$7 -$20
Please join the CU Anschutz Run Club on July 18, 2026 for an on-campus 5k celebrating the outdoors and the CU Anschutz community! We are also raising money for DAWN, CU Anschutz's free clinic.
5K
3
JUL
19

Greeley, CO
• 1.6 miles
$20 -$40
This event raises essential funds to help veterans in our community who are experiencing challenges in their lives. As you complete the 5K course, you will receive a medal to commemorate your...
1m 5K
6
JUL
23

Boulder, CO
• 38.7 miles
$20
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. We are back at CU Potts...
10
JUL
24

Loveland, CO
• 40.9 miles
$25
Join us for the 3rd annual Flyin' Ryan Memorial 5k , a heartfelt event dedicated to honoring the memory of Ryan Vomacka, an exceptional athlete and individual who left an indelible mark on our...
5K
12
JUL
25

Aurora, CO
• 60.8 miles
$10 -$45
The 7/20 Foundation is proud to present the 5th annual Hero’s Journey 5k Run/Walk. This race makes its way through Aurora's City Center and the High Line canal trail with a start and finish in...
5K
17
JUL
26

Golden, CO
• 70.1 miles
$30 -$40
Spirit of the West 5K Run/Walk in Golden, CO - community 5K race featuring great community spirit and atmosphere
5K
135
AUG
1

Aurora, CO
• 59.2 miles
$12 -$47
Join Us for the 12th Annual Run for the Ring 5K & Kids Fun Run! Over the past 12 years, the Run for the Ring 5K & Kids Fun Run has brought together Barbara Davis Center patients, loyal type 1...
5K
11
AUG
1

Denver, CO
• 59.2 miles
Whether you’re a seasoned runner or just love to walk and take in the scenery, SKECHERS Wicked Wine Run is for you! Each course will be held on beautiful properties or various partner vineyards...
1K 5K
18
AUG
2

Denver, CO
• 57.1 miles
$45 -$115
Have you been dreaming of running the Boston Marathon? Need to shave a few minutes off your qualifying time? Or maybe you're just looking for the perfect course to set a new PR? Whether Boston is...
Half Marathon Marathon
53
AUG
4

Fort Collins, CO
• 46.2 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
• 59.8 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
• 64.7 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
• 40.7 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
8

Arvada, CO
• 65.0 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