Found 339 races

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JUL
12

Colorado Springs, CO
$17 -$72
Join us for the Heatwave Half Marathon, 10K, & 5K!A sun-soaked summer challenge that’s perfect for the whole family. The fun includes – Great Swag – designer shirt & custom medalChip-timing with...
1m 5K 10K Half Marathon
72
JUL
12

Lakewood, CO
$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 race uses a handicap...
2m
29
JUL
13

Keystone, CO
High altitude running camp for HS athletes
42
JUL
16

Colorado Springs, CO
$35
This 5K Run/Walk event is in conjunction with the 47th PNAA National Convention in Colorado Springs, CO. 5K Start and Finish Location: Colorado Springs, CO MAP INSERT Bib Pick-Up July 15th PNAA...
5K
24
JUL
18

Denver, CO
$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

Manassa, CO
$20
Come join 500 of your running friends for southern Colorado's oldest and one the region's largest road races. This 5K starts and ends near Jack Dempsey Park. After the race, stick around for the...
5K
8
JUL
18

Aspen, CO
$115 -$145
The Audi Power of Four Trail Run offers runners a scenic mix of trails across the mountains of Aspen Snowmass. Registrants can choose between the 3 distances offered including 50K, 25K & 10K.  
10K 25K 50K
48
JUL
18

Aurora, CO
$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
18

Alma, CO
$10 -$30
Start your morning the Alma way — with a little fresh mountain air, some movement, and a big stack of pancakes. Join us for the Firefighter 5K, a laid-back community run where everyone is...
5K
27
JUL
18

Littleton, CO
$30 -$40
Run for the Eagles!Support the Heritage Eagles Cross Country Team at the 9th Annual Heritage Eagles 5K!Last year’s event raised over $3,500 for the team, and with $10 from each registration going...
5K
19
JUL
18

Steamboat Springs, CO
$25 -$55
The race is held on the beautiful Spring Creek trail with wildflowers and Aspen trees next to bubbling Spring Creek. The 9.5 mile race is run on an up and down scenic loop on primitive trail, two...
5K 9m
28
JUL
18

Castle Rock, CO
$40 -$95
Join runners in Castle Rock for this half marathon.
5K 10K Half Marathon
292
JUL
18

Buena Vista, CO
TransRockies Charity Bibs We are so excited to collaborate with TransRockies to offer charity bibs to this inspiring community! Join us on this 3-day running adventure through the Rockies and do...
11
JUL
19

Manitou Springs, CO
$90 -$500
  The Barr Trail Mountain Race is one of the Front Range’s historic summer mountain running events. The 12.6-mile course begins at the Cog Railway Station (6,570 ft) in Manitou Springs, Colorado,...
45
JUL
19

Greeley, CO
$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
$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
$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

Alamosa, CO
$18 -$25
5K run/walk hosted by the loved ones of Diana Cantu.  Remembering our mother, Diana Cantu, and honoring her legacy. She bravely fought this disease as the resilent person that she was.  The Cantu...
5K
11
JUL
25

Aspen, CO
$80 -$260
http://www.aspenvalleymarathon.com
Half Marathon Marathon
41
JUL
25

Salida, CO
$25 -$40
The National High School Trail Championship (NHSTC) is a 5.4 mile trail race for high school athletes and includes 2026 high school graduates and incoming freshmen. The fourth running of the...
4