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JAN
16

Centennial, CO
• 11.8 miles
$30 -$45
Join in our annual Martin Luther King Jr. Day Run! Today, we gather to honor the legacy of Dr. King and his enduring commitment to justice, equality, and peace. As we lace up our shoes and hit...
1m 5K 10K Half Marathon
4
JAN
30

Centennial, CO
• 11.8 miles
$30 -$45
☕️ 🏃‍♂️ ☕️ 🏃‍♂️ ☕️ 🏃‍♂️ For all the Coffee Lovers, this run is for you! You’ll love the shirt we send you. Set a goal, bring a friend, and join this super fun 5K/10K/13.1 Half-Marathon! The first...
1m 5K 10K Half Marathon
3
FEB
13

Arvada, CO
• 12.6 miles
$30 -$50
Are you a Heart Throb?  Grab your best running buddy and come on out to Johnny Roberts Memorial Park just down from Olde Town Arvada.  Celebrate the ability to get your heart pumping by cruising...
5K
53
FEB
28

Highlands Ranch, CO
• 15.9 miles
$38 -$65
Winter never disappoints us when racing in February in Highlands Ranch!  You won't feel chilly after a course so hilly!  After conquering the 5k, warm up with hot apple cider or hot cocoa at the...
5K
31
MAR
13

Westminster, CO
• 14.3 miles
$38 -$58
Join us for the annual Erin Go Bragh 7.77k! This is THE LUCKIEST race on earth! There may not be a real pot of gold at the finish line of this happy-go-lucky fun run, but there WILL be UNLIMITED...
7K
24
MAR
21

Golden, CO
• 19.6 miles
$20 -$85
All-Out Multicourse is proud to host our 15th Annual Spring Fever, a rewarding event for both novice and experienced athletes set against the backdrop of Table Mountain and the stunning Colorado...
5K 10K Half Marathon
39
MAR
28

Denver, CO
• 1.7 miles
$25 -$50
Is it spring or still winter?  We'll know when we run the Central Park 5k at the end of March!  Celebrate the end of winter with us on this flat and fast course in the historic Central Park...
5K
44
APR
4

Denver, CO
• 7.5 miles
$30 -$40
The Donut Dash 5K is Denver’s race that ends with donuts. Runners and walkers can take advantage of a flat and fast course, and then enjoy fresh donuts at the finish. Our mission is to bring...
5K
40
APR
11

Littleton, CO
• 14.8 miles
$40 -$255
Denver's oldest half-marathon, relay, and 5k along the scenic Platte River Trail in Littleton.
5K Half Marathon
6
APR
24

Westminster, CO
• 14.2 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
16
APR
25

Denver, CO
• 3.3 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
7
MAY
1

Larkspur, CO
• 40.3 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
14
MAY
2

Boulder, CO
• 29.2 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
3
MAY
9

Westminster, CO
• 14.3 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
9
MAY
9

Denver, CO
• 7.4 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
8
JUN
6

Louisville, CO
• 21.5 miles
$30 -$85
The Colorado 13er is THE event where the best parts of trail running and road racing combine to create a truly enjoyable, kind-to-your-body, well-supported 13.1 race! Seasoned runners and...
5K 10K
4
JUN
6

Denver, CO
• 10.3 miles
$30 -$40
Chip-timed 5K run/walk on the paved trails around Sloan's Lake Park in Denver, CO.
5K
8
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