Found 156 races

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JUN
21

Boulder, CO
• 39.2 miles
$25
IN-PERSON-SUNDAY, JUNE 21st START AND FINISH AT FRANKLIN FIELD, CU BOULDER CAMPUS REGISTRATION FEES: Individual: $30/Person Duo: $55/Group of 2 Family (Up to 5 Individuals): $110/Family The 14th...
5K
16
JUN
21

Arvada, CO
• 46.3 miles
$10 -$60
1 Mile in Arvada. Join runners of all abilities
1m 5K 10K 10m
124
JUN
21

Denver, CO
• 49.1 miles
$25 -$45
Lace up your sneakers and come celebrate with Black Women Run and Embrace the Pace Run Club at our 2nd Juneteenth Fun Run 5K! The Juneteenth Fun Run/Walk is an annual community celebration where...
5K
8
JUN
21

Boulder, CO
• 39.2 miles
$20 -$80
Join us on Sunday, June 21st, for the Sunset Trail Running Festival in Gold Hill, CO! Hosted by The Boulder Watershed Collective and in collaboration with T.E.A.M Boulder, all money raised from...
1K 5K 12K 28K
14
JUN
23

Louisville, CO
• 36.9 miles
$30
A 5K (ish) for our school, our kids, and our community. Join us for The Red Schoolhouse Run — a fundraiser run benefiting Jefferson Street Preschool! From stroller-pushers to seasoned runners,...
7
JUN
25

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 Pott’s Field on...
10
JUN
27

Denver, CO
• 49.2 miles
$50 -$60
The Denver Pride 5K is more than just a race—it's a powerful way for supporters of The Center on Colfax to make a difference in the lives of Colorado’s LGBTQ+ community. This event serves as a...
5K
13
JUN
27

Arvada, CO
• 47.1 miles
$20
Join us for our 4th Annual Fitness Expo On Tap event! With various local fitness-related vendors, a free fun run 5k, free yoga, a Beer Mile Run, plus food trucks and LIVE MUSIC....  There's...
5K
9
JUN
27

Boulder, CO
• 37.8 miles
$20 -$45
Join us for the 29th running of the Downtown Boulder Pearl Street Mile on Saturday June 27th, all taking place on the Pearl Street Mall. It is a massive night of 1-Mile races on our criterium...
13
JUN
27

Georgetown, CO
• 70.0 miles
$35 -$150
$55.55 New Year’s Eve Pricing The gnome picked the number.New beginnings, big changes, zero regrets.   Hey Beautiful Slackers!   The 2026 Slacker Races will be held on June 27  Start Time...
4m Half Marathon
42
JUN
27

Bellvue Colorado
• 106.3 miles
Crisp morning air and a summer sunrise in Colorado. YES PLEASE! Join us on the foothills at Lory State Park for a fun & beautiful morning trail race experience. This run race features three...
5K 5m 10m
33
JUN
28

Idaho Springs, CO
• 61.8 miles
$175 -$185
Although the air will be noticeably thin at the starting line, Echo Lake's 10,600 feet of elevation is just the beginning. The climb totals nearly 4,000 vertical feet - much of it above treeline...
23
JUL
4

Arvada, CO
• 47.1 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

Boulder, CO
• 34.4 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

Fort Collins, CO
• 106.3 miles
$10 -$55
Friday July 4th, 2026 Walk ⭐️ Jog ⭐️ Run ⭐️ Race Kick off your holiday festivities with a 5k in City Park, Fort Collins Start your Fourth of July with movement, community, and celebration at the...
5K
35
JUL
4

Greeley, CO
• 103.9 miles
$35 -$45
Celebrate the Fourth of July with run.Windsor in Greeley, Colorado as we bring back the annual July 4th Freedom 5k walk and run, along the Greeley Stampede 4th of July Parade Route! Participants...
5K
70
JUL
4

Buena Vista, CO
• 52.8 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
• 37.7 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
• 25.4 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

Red Feather Lakes, CO
• 115.7 miles
$40 -$50
Enjoy a scenic fun run in and around Red Feather Lakes, Colorado including a route through Fox Acres Golf Course! Start at and finish at The Tavern at Red Feather Lakes for an expo in the parking...
3m
44