Found 177 races

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SEP
23

Winter Park, CO
• 48.9 miles
$150 -$400
Vertical endurance race climbing the elevation of Mt. Everest in Winter Park, CO.
19
SEP
26

Estes Park, CO
• 54.0 miles
$90 -$265
​Join us for the Estes Epic on September 26-27, 2026 —a premier event featuring a 50k Bike Race, 50k Run, and Heavy Half Marathon. After a six-year hiatus, this challenging race returns, offering...
Half Marathon 50K
41
SEP
26

Littleton, CO
• 16.9 miles
$40 -$65
Put on your lederhosen and sneakers as we kick off the annual HRCA Oktoberfest 5K in Town Center on Saturday, September 26, starting at 9:00 a.m.! Celebrate fall with a family-friendly,...
5K
27
SEP
26

Commerce City, CO
• 3.5 miles
$35 -$65
A running music festival blending a fun run with live DJs, light shows, and an after party.
32
SEP
26

Broomfield, CO
• 17.2 miles
$25 -$40
RUNWAY 5K: In-Person (Broomfield, CO) and Virtual (Anywhere)! A Benefit Run/Walk for Angel Flight West Join Us to Run for a Cause That Matters! Funds raised will support Angel Flight West and...
5K
17
SEP
27

Larkspur, CO
• 37.0 miles
$60
WELCOME Welcome to the 4th annual Greenland Open Space Pack Burro Race presented by Double Rainbow Ranch! Grab your burro and join us for a fun and rewarding day on the majestic Greenland Open...
3m 8m
2
SEP
27

Wiggins, CO
• 52.4 miles
$40
Join us for the Pat Mahan Memorial 5K in Wiggins, Colorado, a family-friendly event celebrating the life and legacy of Pat Mahan.  Lace up your running shoes and hit the course with us as we...
5K
2
SEP
27

Boulder, CO
• 28.5 miles
$40 -$500
This is a virtual race open to supporters across the country who want to take action for children and families. Participants can run, walk, or move in their own community while supporting a...
5K 10K Half Marathon
18
OCT
3

Westminster, CO
• 15.7 miles
$40 -$48
Hi Friends of Big Waves! We are looking forward to having everyone back for our family 5k this year! Please reach out if you have any questions that you don't see the answers for here. My email...
5K
15
OCT
3

Littleton, CO
• 13.5 miles
$10 -$80
Scenic 10-mile and 10K trail races in the HRCA Backcountry Wilderness Area, Littleton, CO.
10K
16
OCT
3

Lafayette, CO
• 19.9 miles
$45 -$75
Lafayette Music Fest is put on by Rock for the People, a 501(c)(3) nonprofit organization in Lafayette, CO with the mission of building an inclusive live music community by offering free and...
5K 10K
11
OCT
3

Littleton, CO
• 17.2 miles
$100 -$120
One trail 5K every hour, on the hour, for 6 straight hours.
3
OCT
3

Broomfield, CO
• 18.1 miles
$15 -$55
Prospect Ridge Academy is thrilled to present our 16th Annual Miner Gold Rush and Fall Festival! All proceeds will benefit Prospect Ridge Academy, a public charter school providing a rigorous,...
1m 5K
8
OCT
3

Loveland, Colorado
• 45.3 miles
Experience the ultimate Colorado adventure at Boyd Lake State Park! This event pairs you and your dog for a scenic run filled with fun, beginner-friendly obstacles. It’s all about local vibes,...
2m
1
17
OCT
4

Lorton, VA
• 16.1 miles
$50 -$67
Located just south of the Capital Beltway in Lorton, this beautiful race course includes a mixture of forested and open meadow singletrack meandering through 1600 acres of the former prison...
5m 10m
4
OCT
4

Aurora, CO
• 3.0 miles
$10 -$15
Rocky Mountain Road Runners holds a monthly Trophy Series in the Denver area.  We provide a low-key, low-cost racing environment. Everyone is welcome to run with us! The 8mi race uses a handicap...
5K 8m
48
OCT
4

Windsor, CO
• 49.3 miles
$20 -$154
Welcome to the Windsor Marathon. This event starts and ends at The Island at Pelican Lakes in Water Valley, with a great after party including breakfast, drinks and music. Tour beautiful Windsor...
1m 5K 10K Half Marathon Marathon
13
OCT
10

Windsor, CO
• 49.7 miles
$25 -$50
Packet Pick Up and Same Day Registration: 7:00am-7:45am on October 10th at Boardwalk Park in Windsor. 5k Run Starts at 8am! Come run, walk, and skip around the beautiful Windsor Lake!  Not into a...
5K
4
OCT
11

Westminster, CO
• 14.3 miles
$45 -$85
Join the WESTY HALF and 5k this fall! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas.  Whatever...
5K Half Marathon
91
OCT
17

Sedalia, CO
• 23.3 miles
$50 -$170
The Human Potential Running Series PresentsThe Indian Creek Trail Runs @ Indian Creek Campground The Indian Creek Trail Runs is the oldest official race of HPRS and is also known as our annual...
55K
8