Trail RunningColorado
Trail Running in Colorado
Browse upcoming amateur trail running events and compare dates, locations, and popularity. in Colorado.
Upcoming dates Colorado Community-rated events
Events listed
113
Sport
Trail Running
Area
Colorado
Radius
350 km
This calendar in numbers
This calendar currently lists 113 upcoming events, from Aug 14, 2026 to Jun 26, 2027. September is the busiest month, with 45 events scheduled. Events are spread across 79 different locations; Colorado Springs hosts the most (9). Course distances range from 5 km to 161 km.
Browse all 113 events by date
August 2026
- San Juan Softie 100 Aug 14
- Boulder Rez Marathon Aug 15
- Enlightenment Mountain Run Aug 15
- Leadville Trail 100 Mile 2026 Aug 15
- Med Bow Rail Marathon and Half Marathon Aug 15
- Med Bow Rail Marathon and Half Marathon Aug 15
- MOCO Trails Wild West Backyard Ultra Aug 15
- Roxborough Ultras Aug 15
- Roxborough Ultras Aug 15
- The Cheyenne Mountain Run Aug 15
- The Cheyenne Mountain Run Aug 15
- Westminster Night Trail Aug 15
- Westminster Trail Race Aug 15
- Leadville 10K Aug 16
- Pikes Peak Marathon 2026 Aug 16
- Into the Hills 5K - Lory Summer Trail Series Aug 18
- 6-HOUR QUARRY MOUNTAIN QUEST Aug 22
- Antelope Dash Aug 22
- Arrowhead Half Marathon & 5K Aug 22
- Arrowhead Half Marathon & 5K Aug 22
- Bergen Peak Half Marathon Aug 22
- Byers Peak Stampede Aug 22
- Cheatin’ Woodchuck Chase Aug 22
- Leadville Trail 100 Aug 22
- Staunton Rocks! Marathon & Half Aug 22
- Staunton Rocks! Trail Marathon & Half Aug 22
- Telluride Mountain Run Aug 22
- Telluride Mountain Run Aug 22
- The Antelope Dash Aug 22
- Rebel Run 5k Aug 23
- Eltuck Valley 12K – Lory Summer Trail Series Aug 25
- Boulder Sunset Run Aug 29
- Continental Divide Trail Run Aug 29
- Ouray 50 Mile Endurance Run Aug 29
- Rock Hawk Aug 29
- Rock Hawk Trail Race Aug 29
- Rocky Mountain Run 5K Aug 29
- Wine Run 5k at The Winery at Holy Cross Abbey Aug 30
September 2026
- Front Range Ultra Dayze Sep 3
- Front Range Ultra Dayze Sep 3
- Mighty Marmot Kids Trail Race #1 Sep 4
- Cirque Series - Arapahoe Basin Sep 5
- Creede Mountain Run Sep 5
- Grand Traverse Mountain Run Sep 5
- 10k @ 10,000 Feet Sep 6
- 10k at 10,000 Feet Sep 6
- 53rd Annual Imogene Pass Run Sep 12
- American Heroes Run Sep 12
- Black Squirrel Half Sep 12
- Black Squirrel Half Marathon Sep 12
- Break Your Neck: Walk, Run, or Roll Sep 12
- Imogene Pass Run Sep 12
- MeadowGold 11K & 5K Sep 12
- Meadowgold 5K and 11K Trail Run Sep 12
- Ned Ned Half Marathon Sep 12
- Ned Ned Trail Fest Sep 12
- NedNed Trail Fest Sep 12
- Pikes Peak Challenge Sep 12
- Snow Mountain Ranch Trail Festival Sep 12
- Trail Sisters Women's Trail Half Marathon Sep 12
- Colorado Mountain Half+ Series 2026 Sep 13
- Ouray 50 Miler Sep 13
- Lake Fork Flyathlon Sep 18
- Mighty Marmot Kids Trail Race #2 Sep 18
- 2026 Pikes Peak Ascent Sep 19
- All-Out Fallfest Sep 19
- Autumn Run Sep 19
- Autumn Run Sep 19
- Break of Dawn North Table Trail Race Sep 19
- Break of Dawn Trail Run Sep 19
- Ouray Mountain Trail Run Sep 19
- Expo Park XC Sep 20
- Red Feather Trail Jamboree – 3 Day Challenge Sep 25
- Red Feather Trail Jamboree – 50Mile Sep 25
- Colorado Brain Tumor Walk & Race Sep 26
- Cougar Ridge Classic Sep 26
- Cougar Ridge Classic 26K Trail Run Sep 26
- Deep Creek Trail Half Marathon Sep 26
- OUTLAST COLORADO SPRINGS Sep 26
- So Long to Summer 5K/10K Sep 26
- West Line Winder Sep 26
- Red Feather Trail Jamboree - 50k Sep 27
- Red Feather Trail Jamboree – Half Marathon Sep 27
October 2026
- Mighty Marmot Kids Trail Race #3 Oct 2
- Cart to Cart Trail Run Oct 3
- Emerald Mountain Trail Run Oct 3
- OUTLAST DENVER Oct 3
- Rim to Rim Royal Gorge Race Oct 3
- Sage Burner Trail Race Oct 3
- Sage Burner Trail Race Oct 3
- The Bear Chase Oct 3
- The Bear Chase 100K, 50M & 50K Oct 3
- West Elk Challenge Trail Marathon Oct 3
- Pikes Peak Road Runners Fall Series I Oct 4
- The Bear Chase Half Marathon & 10K Oct 4
- Boulder XC Series – Meet 1 Oct 10
- Suffer Better Fall Trail Run Oct 10
- Westy Half & 5k Oct 11
- Blue Sky Marathon Oct 17
- Blue Sky Trail Marathon Oct 17
- Bobcat Trail Races Oct 17
- Blue Sky Half Marathon Oct 18
- Colorado 24 Hour Run Oct 31
November 2026
- Louisville Trail Race Nov 14
- Louisville Trail Race Nov 14
- Colorado Cold Rush Ultra Nov 21
February 2027
March 2027
April 2027
May 2027
- Colorado Marathon May 2
- The Pilgrimage May 2
June 2027
- Rueter-Hess Trail Run Jun 26