Found 255 races

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

JUN
23

Louisville, CO
• 50.5 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
• 45.9 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
25

Alma, CO
• 96.5 miles
$10 -$155
At Town Park finisher beer, trail, scenic, family-friendly
6m 10K 13m Half Marathon 26m 40m
73
JUN
26

Bailey, CO
• 84.6 miles
$10 -$20
Come one, come all to the first annual "Four Legged 5k" foot race, organized and hosted by the Bailey Chamber of Commerce and benefitting one of our local non-profit organizations, Peaceworks!...
5K
5
JUN
27

Evergreen, CO
• 70.3 miles
DescriptionCome run with us in beautiful Evergreen at Alderfer/3 Sisters Park!This race day will offer a 10k race coursing through the amazing park.Play fun games from our rec trailer, visit our...
10K
21
JUN
27

Evergreen, CO
• 70.3 miles
DescriptionCome run with us in beautiful Evergreen at Alderfer/3 Sisters Park!This race day will offer a 5k race coursing through the amazing park.Play fun games from our rec trailer, visit our...
5K
10
JUN
27

Littleton, CO
• 75.4 miles
$45
Come join the Before The Fourth 5k for some healthy fun in Clement Park on June 27th.  The park is located just south of Denver, in Littleton, Colorado. This is a great opportunity to build...
5K
33
JUN
27

Denver, CO
• 69.6 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
• 59.5 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
7
JUN
27

Boulder, CO
• 44.0 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

Steamboat Springs, CO
• 67.1 miles
$35 -$55
Come join us for an exciting new race as part of the SBT GRVL race weekend. Experience the challenging yet beautiful trails at the historic Howelsen Hill ski area, one of the oldest in the...
5K 10K
22
JUN
27

Georgetown, CO
• 63.8 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

Glenwood Springs, CO
• 119.1 miles
$50 -$110
Welcome to the Sunlight Mountain Race Series brought to you by Arc'teryx Aspen, where mountain air, winding trails, and a vibrant community come together for an unforgettable summer of running....
5K 10K Half Marathon
23
JUN
27

Bellvue Colorado
• 20.9 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
• 39.3 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...
21
JUN
28

Littleton, CO
• 17.2 miles
$10 -$25
Cade's Cause Cade's Cause is a community event created to honor Dr. Cade Carlson, raise awareness about the lasting impact of concussions and repetitive head impacts, and turn our unimaginable...
2
JUL
3

Granby, CO
• 71.7 miles
The course runs through Kaibab Park as well as downtown Granby! Start and finish areas are at the Destination Granby offices (516 East Agate Ave.). The course elevation is 7,935 feet. The run is...
5K
12
JUL
4

Aspen, CO
• 100.2 miles
$65 -$150
Join us for the 40th Annual Boogie's Buddy Race, Presented by Aspen Valley Health!Saturday, July 4, 2026  Rio Grande Park Aspen: 427 Rio Grande Pl, Aspen Kick off your Fourth of July weekend at...
5K
32
JUL
4

Arvada, CO
• 33.3 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
• 5.4 miles
$43 -$55
Please visit our official race website at www.runtochangelives.org for more registration options.
1K 5K Half Marathon