Found 156 races

🎉 Join Your Local Running Community!

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

AUG
8

Longmont, CO
• 11.4 miles
$20 -$45
Come join us on August 8, 20226  for a race around the entirety of beautiful Lake McIntosh! This 3.5 mile race is a half paved/half dirt course surrounded by wonderful mountain views, vast...
10
AUG
8

Berthoud, CO
• 32.4 miles
$5 -$75
Eat. Run. Adopt. Join us for Berthoud’s first-ever community-driven 10k!  In partnership with Berthoud Pet Supply, this isn’t just a race—it’s a moving feast with a mission. A portion of race...
10K
35
AUG
8

Thornton, CO
• 10.2 miles
$17 -$48
Join us for the annual Summer Sizzler 5k/10k/15k!  A fun summer event that is perfect for the whole family. The fun includes - Great Swag - designer shirt & custom medal Chip-timing with live...
1m 5K 10K 15K
286
AUG
11

Bellvue, CO
• 25.4 miles
$25 -$30
Join us August 5, 12, 19 & 26 for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their...
10K
20
AUG
15

Denver, CO
• 17.2 miles
Miles for Migraine will host its 6th annual 2-mile Walk, 5K Run and Relax Denver Event at Great Lawn Park. This event is a fundraiser for Migraine & Headache Awareness, Treatment & Research....
2m 5K
19
AUG
15

Longmont, CO
• 23.1 miles
$10 -$40
The Sunrise Stampede 5K and 1-Mile Fun Run/Walk is a community celebration that brings together neighbors, schools, students, families, educators, local businesses, and supporters from across St....
1m 5K
4
AUG
16

Erie, CO
• 16.5 miles
$45 -$85
5K road featuring competitive racing and community celebration
5K Half Marathon
129
AUG
18

Bellvue, CO
• 25.4 miles
$25 -$30
Join us August 5, 12, 19 & 26 for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their...
5K
24
AUG
22

Westminster, CO
• 39.2 miles
$45 -$55
Now in its 28th year, the Jog in the Bog 5K is a fun opportunity to get active while supporting SLHS.    Registration includes a commemorative t-shirt, goodie bag, entry into prize drawing, and...
5K
AUG
22

Denver, CO
• 49.0 miles
$20 -$40
Run in Denver, CO with t-shirt
1m 5K
32
AUG
23

Westminster, CO
• 40.6 miles
$40 -$95
Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too!  Everyone is back to school and slipping into a routine.  Make this your...
5K 10K Half Marathon
271
AUG
23

Denver, CO
• 49.2 miles
$8 -$55
Be part of something bigger at Conservation Colorado’s second annual Rebel Run 5K — where movement meets momentum for our climate, air, land, water and communities. Last year, more than 230...
5K
24
AUG
25

Bellvue, CO
• 25.4 miles
$25 -$30
Join us August 5, 12, 19 & 26 for a fun series of shorter midweek trail races. This fourth race of the series will take place on the fast and flat Valley Trail at Lory State Park. Our goal is to...
12K
24
AUG
27

Commerce City, CO
• 43.9 miles
DescriptionPut your problem-solving skills to the test in this exciting puzzlingcompetition! Participants will race against the clock to completea 300-piece jigsaw puzzle. Whether you’re a...
5
AUG
29

Allenspark, CO
• 43.4 miles
$20 -$55
Hello Runners and Dog Lovers! Welcome to the 14th annual Run Like The Wind 5k / 2k run in Allenspark on Labor Day weekend - Saturday, August 29th at 9am, hosted by the Old Gallery.  Register now...
2K 5K
9
SEP
5

Arvada, CO
• 48.6 miles
$25
Lace up your shoes and join us for the Demon Dash at its new course at the NAAC! We're excited to bring this course its new home and onto dirt! Whether you are a runner or walker, this will be a...
5K
16
SEP
5

Brighton, CO
• 31.4 miles
$55 -$150
Introducing the Raising the Barr Ultra Race.  Try to finish as many 10 mile loops around the lake in the first 4 or 10 hours and then switch to 1 mile loops for the last few hours of your race....
8
SEP
7

Loveland, CO
• 16.9 miles
$65
See the Northern Colorado All-Ability communities come together in faith and sports through FCA All-Abilities. We are running for: Awareness of sports programs for all ages for individuals with...
5K
4
SEP
7

Loveland, CO
• 28.4 miles
$10 -$65
Join us for the Labor Day 5kSee the Northern Colorado All-Ability communities come together in faith and sports through FCA All-Abilities. We are running for: Uniting All-Abilities through faith...
5K
2
SEP
10

Greeley, CO
• 39.2 miles
$15 -$45
✨🦸 Welcome to the 14th Annual Superhero Run! 🦸✨ This isn’t just a race - it’s a chance to make an impact by stepping up for others. On Saturday, September 19, 2026, we’ll be back at Greeley’s...
1m 5K 10K
9