Found 226 races

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

OCT
3

Westminster, CO
• 65.8 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
14
OCT
3

Colorado Springs, CO
• 112.8 miles
$8 -$500
Come celebrate the 13th Annual Colorado Springs Marathon Saturday, October 3, 2026!  Whether you are a seasoned runner or looking to tackle your first 5k, we have you covered with 4 events to...
5K Half Marathon Marathon
53
OCT
3

Fort Collins, CO
• 70.5 miles
$25 -$50
Saturday, October 3rd at 8:00 am Join fellow Rams and CSU friends for the 46th annual Homecoming 5K! The race is a great way for community, alumni, and students to come together for fun, fitness,...
5K
13
OCT
3

Littleton, CO
• 78.2 miles
$10 -$80
The Wildcat Mountain Trail Races showcase some of the most scenic terrain in the HRCA Backcountry Wilderness Area, giving runners a true taste of the rolling hills, open views, and natural beauty...
10K
15
OCT
3

Lafayette, CO
• 70.7 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
8
OCT
3

Littleton, CO
• 81.5 miles
$90 -$120
What Is OUTLAST? OUTLAST is a 6-hour trail endurance challenge where runners complete a 5K every hour, on the hour. Each lap must be finished within the hour to stay in the event. If you finish...
2
OCT
3

Broomfield, CO
• 66.6 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
7
OCT
3

Loveland, Colorado
• 67.4 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
16
OCT
4

Lorton, VA
• 76.0 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
3
OCT
4

Aurora, CO
• 63.3 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
45
OCT
4

Windsor, CO
• 59.5 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
12
OCT
10

Windsor, CO
• 59.7 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
3
OCT
10

Manitou Springs, CO
• 112.9 miles
$25 -$40
3rd annual Manitou 5K!  Come celebrate the beauty of Manitou Springs!  Race starts and ends in Fields park.  Run along the rolling creek, view the art along the Creekwalk, loop the beautiful...
5K
70
OCT
10

Fort Collins, CO
• 68.5 miles
$35 -$120
Join us on a journey from Fort Collins to Loveland. The marathon begins at Edora Park in Fort Collins and ends at Fairgrounds Park in Loveland. The half-marathon starts at Fossil Creek Park and...
5K Half Marathon Marathon
57
OCT
11

Fort Collins, CO
• 71.0 miles
This fun run is held on national coming out day this out and back Greenway 5K is here to celebrate everyone and anyone! There will be an unofficial clock and a mini award ceremony after. this is...
5K
3
OCT
11

Westminster, CO
• 71.5 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
90
OCT
17

Fort Collins, CO
• 71.8 miles
$100 -$130
Welcome to the Blue Sky Trail Marathon & Half, Fort Collins's original and only trail marathon. Taking place on the trails between Horsetooth Mountain Park and the Devil's Backbone Open Space,...
Half Marathon Marathon
6
OCT
17

Sedalia, CO
• 83.7 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
6
OCT
17

Denver, CO
• 73.5 miles
$30
Participants joining our inaugural annual 5K and Family Run/Walk will help bring awareness for clean, sustainable water solutions to communities in need and support our disaster response...
5K
3
OCT
17

Lakewood, CO
• 82.8 miles
$65 -$90
Welcome to the Great Trailhead Foot Race at Bear Creek Lake Park!  Featuring legitimate TRAILS in the shadow of Denver's skyline, you'll love the single-track and dirt as you race 5 miles, or a...
5m 10m
63