Found 292 races

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APR
11

Littleton, CO
• 9.0 miles
$40 -$255
Welcome to the Platte River Half Marathon, Relay & 5k race, one of the most exciting and popular races in the Denver Metro Area! This race is held annually in Littleton, CO. We’re thrilled to...
5K Half Marathon
3
APR
24

Westminster, CO
• 5.9 miles
$20 -$85
Unleash your inner superhero at the 15th Annual Beat the Heat event! This year, we're calling all champions to assemble where one of Colorado's favorite trails joins one of its most glorious...
5K 10K Half Marathon
10
APR
25

Denver, CO
• 8.6 miles
$15 -$56
Ready to gallop around Denver with some friends?  Yeah, you are!  Come frolic with us at the Unicorn Runner 5k at Great Lawn Park to kick off your spring running season!  You'll earn a sweet tee...
2m 5K
4
MAY
1

Larkspur, CO
• 29.1 miles
$35 -$105
The Greenland Trail Race offers four outstanding distances in southern Douglas County. Run the 4 Miler, the 8 Miler, the 25K, or tackle the 50K ultramarathon, Colorado’s fastest 50K! With Pikes...
4m 8m 25K 50K
7
MAY
2

Boulder, CO
• 38.1 miles
Rise Against Suicide's 17th annual Emerge 5K Walk/Run Join Rise Against Suicide's 17th annual Emerge 5K Walk/Run- a free, family-friendly walk/run supporting youth mental health and suicide...
5K
1
MAY
2

Fort Collins, CO
• 38.0 miles
$40 -$235
Early Bird Registration will open on July 1, 2026. Join us for the Colorado Marathon in Fort Collins next May! Our annual event takes place in the stunning Poudre Canyon and the gorgeous natural...
5K 10K Half Marathon Marathon
5
MAY
9

Westminster, CO
• 22.9 miles
$35 -$80
DescriptionWe are excited for the 2027 Colorado Women's Classic! While focused on women, all genders are WELCOME at this event!   We will run this event rain or shine! :) This is THE race for...
0m 5K 10K 10m
3
MAY
9

Denver, CO
• 12.4 miles
$26 -$39
Celebrate Mother’s Day in Motion at the 2027 Denver Mother’s Day 5K! Looking for a fun, active, and memorable way to celebrate Mother’s Day this year? Join us for the Denver Mother’s Day 5K—a...
5K
6
MAY
15

Divide, CO
• 48.4 miles
$60 -$160
The Human Potential Running Series Presents:The Endure Trail Runs @ Mueller State Park The Endure 12-Hour is a one-of-a-kind 12-Hour timed event designed by YOU… and tiny colorful balls. Each...
10K Half Marathon Marathon
5
JUN
5

Eaton, CO
• 53.4 miles
$35 -$237
Join us for three days of running excitement! Whether you're tackling the events individually or teaming up for relays: 14 mile, full marathon, 50k, 5 miles 100k,100 miles, or taking on a 7K Run...
7K 14m Marathon 50K 50m 100K 100m
FEB
10

Colorado Springs, CO
• 90.7 miles
$85
Join the Journey! Register for 50 States Half Marathon Club "General Membership"! General Membership: $85 to join (then annual dues each year after, currently $35.00 per year). You may save on...
Half Marathon
59
FEB
11

Colorado Springs, CO
• 90.7 miles
$429
Join the Journey! Register for Fifty States Half Marathon Club "Life Membership"! You may save on online processing fees by registering directly at our club website. $429 includes: Joining Fee...
Half Marathon
61
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