Found 187 races

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

JUL
4

Arvada, CO
• 9.4 miles
$5 -$6
Join us as we take on the Donut Hole Mile to be held as part of our 4th of July celebration! If you're familiar with a traditional Beer Mile, the donut hole mile is a fun twist for all ages! Run...
3
JUL
4

Castle Rock, CO
• 26.8 miles
$43 -$55
Please visit our official race website at www.runtochangelives.org for more registration options.
1K 5K Half Marathon
1
JUL
4

Boulder, CO
• 26.1 miles
$40 -$45
Join us for the 17th edition of the Avery Brewing Company 4K on the 4th, which is one of Boulder’s best running traditions to do on the 4th of July! July 4th is celebrated in a number of...
4K
5
JUL
4

Littleton, CO
• 12.0 miles
$45 -$65
Kick off your 4th of July with a family-friendly and festive 5K on Saturday, July 4, beginning at 7:30 a.m.! Celebrate Independence Day with a fun morning on the move — this spirited run/walk...
5K
34
JUL
4

Buena Vista, CO
• 1.8 miles
$30 -$35
Join us for the Independence Day 5K in Buena Vista, CO on July 4th, 2025!  
3K 5K
13
JUL
4

Louisville, CO
• 19.8 miles
$40 -$65
Let Freedom Run 5k/10k - Louisville in Louisville - 5K, 10K. Register today for this exciting race!
0m 5K 10K
235
JUL
4

Longmont, CO
• 33.0 miles
$40 -$55
Dress up as your favorite American Hero! This could be your mom, dad, Albert Einstein, Batman, Superman, or the Powerpuff girls! This event is all about celebrating GREAT people who do and have...
0m 5K
54
JUL
4

Palmer Lake, CO
• 41.8 miles
$20 -$50
Charity fun in Palmer Lake benefiting important causes with great community spirit
115
JUL
6

Boulder, CO
• 23.3 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
• 23.1 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
• 13.4 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
• 26.7 miles
$33 -$40
Cookie Chase in Denver, CO - annual community running event featuring great community spirit and atmosphere
5K
40
JUL
11

Denver, CO
• 25.0 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
11

Littleton, CO
• 13.2 miles
$17 -$85
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
47
JUL
12

Lakewood, CO
• 21.8 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 race uses a handicap...
2m
29
JUL
18

Denver, CO
• 25.7 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
• 26.8 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
18

Littleton, CO
• 15.1 miles
$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

Castle Rock, CO
• 4.6 miles
$40 -$95
Join runners in Castle Rock for this half marathon.
5K 10K Half Marathon
292
JUL
23

Boulder, CO
• 47.0 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