Found 220 races near Boulder County, CO

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JUN
4

Louisville, CO
• 16.0 miles
A 5K for our school, our kids, and our community. Join us for the Red Schoolhouse Run — a fundraiser 5K benefiting Jefferson Street School! From stroller-pushers to seasoned runners, this race is...
12
JUN
6

Commerce City, CO
• 16.0 miles
DescriptionThis rafting trip will be a great time! This will be a beginner to intermediate trip. Depending on the water levels and how fast the ware is going on the day of. This is an...
6
JUN
6

Berthoud, CO
• 20.5 miles
$35 -$45
The Berthoud Day 5K is a fun, family-friendly race that kicks off the Berthoud Day Parade with energy, connection, and hometown pride. Open to runners, walkers, families, strollers, and even...
5K
15
JUN
6

Johnstown, CO
• 47.3 miles
$30 -$40
5K in Johnstown with scenic views. Family-friendly event
1m 5K
189
JUN
6

Fort Collins, CO
• 32.2 miles
$50
This event brings together the community to support scholarships for anyone who identifies as a woman and is seeking treatment for drug and alcohol addiction. These funds bridge financial gaps...
5K
40
JUN
6

Granby, CO
• 30.3 miles
The Human Potential Running Series Presents: The Summits Trail Runs @ Granby Ranch Resort The Summits Trail Runs occu...
Half Marathon Marathon 50K
86
JUN
7

Louisville, CO
• 17.6 miles
The Colorado 13er is a unique race combining trail and road running on a scenic 13.1-mile loop course in Louisville. It is well-supported and accessible for runners of all levels, offering a mix...
5K 10K Half Marathon
43
JUN
7

Denver, CO
• 16.8 miles
$36 -$40
Annual run in Denver with supportive community atmosphere and race day excitement
5K
287
JUN
7

Denver, CO
• 38.6 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...
4K
32
JUN
10

Idaho Springs, CO
• 15.3 miles
Run the Mighty ARGO hill this summer in a 4 race series! This is a grass(gold)roots, backyard style event. Meet at 5pm in the park across from the Argo to pick up your wristband. Race starts at...
13
JUN
11

Boulder, CO
• 17.7 miles
$15 -$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 Pott’s Field on...
1m
16
JUN
13

Fort Lupton, CO
• 29.4 miles
DescriptionA certified 5k Race starts on South Harrison Avenue in front of the back parking lot. Start time 8:00am. Runners will take off first; Walkers immediately following. Packet Pick up at...
5K
25
JUN
13

Arvada, CO
• 20.5 miles
$40 -$85
Join us for our 14th annual Summer Breeze, benefiting the Food Bank of the Rockies! This event features 5K, 10K, and Half Marathon courses that meander along the Van Bibber Creek Trail, offering...
5K 10K Half Marathon
526
JUN
13

Loveland, CO
• 45.8 miles
$85
Are you ready to test your limits and honor our heroes? Join us for the 5th Annual Health4Heroes Guardian Games, an electrifying Military and First Responder-inspired fitness competition like no...
15
JUN
13

Parker, CO
• 26.7 miles
$30
Fun 3 mile walk benefitting Habitat for Humanity of Metro Denver. June 13, 2026, 9 - noon  
7
JUN
13

Fort Collins, CO
• 35.5 miles
$25 -$40
Sam’s Rainbow Run: Honoring a Legacy of Love and Kindness I started Sam’s Rainbow Run as a way to honor Sam’s legacy and keep his spirit alive. Sam was passionate about helping those less...
5K
12
JUN
13

Littleton, CO
• 37.6 miles
$35 -$45
Stepping Stone Support Center and Trailhead Community have come together to present this amazing event to benefit adults with developmental disabilities, raising both awareness and funds to give...
2K 5K
24
JUN
13

Thornton, CO
• 9.0 miles
$17 -$85
Every Registration IncludesGreat Swag - designer shirtCustom medalChip-timing with live results and awardsFree photosGreat snacks at the finish line!Plenty of fun!Grab your friends and family,...
1m 5K 10K 15K
32
JUN
13

Broomfield, CO
• 20.3 miles
$35
Grab those tutus and come run with us to raise money for the Colorado Conservatory of Dance. This run/walk will be a party full of smile, music, and dancing! The 5K is a 3 loop course on a...
5K
23
JUN
14

Littleton, CO
• 10.3 miles
$40 -$84
                                               Run the Race. Stay for the Party. 
5K 10K
16