Found 213 races

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SEP
26

Broomfield, CO
• 100.5 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
12
SEP
26

Westcliffe, CO
• 23.7 miles
$60 -$375
The Human Potential Running Series PresentsThe Sangre de Cristo Trail Festival @ Music Meadows Ranch Come join us on the Rainbow Trail in the Sangre de Cristo mountains. Run beneath the watchful...
27K 50K 100K
136
SEP
26

Buena Vista, CO
• 43.3 miles
$125 -$190
With glorious views of the Collegiate Peaks and 4,000ft of ascent along the way, these 18 or 30 miles of buttery single track and forest roads are perfect for everyone from the first time trail...
30K 50K
1
SEP
27

Buena Vista, CO
• 43.3 miles
$35 -$50
14er Fest is a multi-user trail event held in the fall in Buena Vista, CO. Trail running is a key component of the event, and we offer two unique races as options. In the spirit of "14er" Fest,...
5K 14K
22
OCT
3

Colorado Springs, CO
• 42.9 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
52
OCT
3

Littleton, CO
• 82.3 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
14
OCT
3

Thornton, CO
• 99.7 miles
You CAN 5k.  This event is for EVERY ONE.  EVERY BODY.  You won't get lost.  You won't get forgotten.  You'll run (or jog or walk or crawl) a clearly marked 5k course with friendly volunteers...
5K
29
OCT
3

Littleton, CO
• 78.6 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...
1
OCT
3

Canon City, CO
• 13.3 miles
$40 -$100
Get ready for a ROYALly GORGEous experience! Whether you’re tackling the 5K, the 8-mile trail run, or the half marathon trail run, this event offers something truly special. All three races...
5K 8m Half Marathon
25
OCT
4

Lorton, VA
• 79.6 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
OCT
4

Aurora, CO
• 95.3 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
38
OCT
4

Aspen, CO
• 87.7 miles
$60 -$65
Join us on Sunday, October 4, for a Halloween themed 5.6K (3.5 mile) run or 1 mile walk beginning at Koch park and winding through the Marolt foot path and Moore open space with your furry...
1m
52
OCT
10

Breckenridge, CO
• 75.9 miles
$25 -$150
Join us for an unforgettable two-day running experience in the heart of Breckenridge!Our Breckenridge RunFest kicks off Saturday with a 5K and 10K along Main Street, followed by the Half Marathon...
5K 10K Half Marathon Marathon
21
OCT
10

Manitou Springs, CO
• 41.2 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
68
OCT
11

Westminster, CO
• 100.1 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
87
OCT
17

Sedalia, CO
• 71.9 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
OCT
17

Denver, CO
• 92.9 miles
$30
Participants joining our inaugural annual 5K Run/Walk will help bring clean, sustainable water solutions to communities in need and support our disaster response initiatives. We will be hosting...
5K
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
60
OCT
18

Denver, CO
• 91.1 miles
10K Half Marathon
32
OCT
18

Palmer Lake, CO
• 53.8 miles
$15 -$45
Colorado’s Shortest (and Most Legendary) Run is Back!     Mark your calendars: Sunday, October 18th, 2026, for the 12th Annual PALMER LAKE .5K — yes, that’s Point Five K — brought to you by Awake...
5K
1