Skip to content
SundayMarathon

All countries / United States

Marathon directory

Marathons in Colorado, United States

100 upcoming marathons listed in Colorado across 6 cities. Next: San Juan Softie 100 on August 14, 2026.

100marathons upcoming
6cities
August 14, 2026Next race
Marathon, Half marathon, Ultra, 10K, 5K, RelayDistances
Durango, Colorado, United States
14AUG
ULTRA
San Juan Softie 100
Durango, Colorado, United States
August 14, 2026 AUG
Ridgway, Colorado, United States
15AUG
21.1K
Mt. Sneffels Half Marathon-10K-Kids-Fun Run
Ridgway, Colorado, United States
August 15, 2026 AUG
Centennial, Colorado, United States
15AUG
21.1K
Bagel Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
August 15, 2026 AUG
Leadville, Colorado, United States
15AUG
ULTRA
Leadville Trail 100 Run
Leadville, Colorado, United States
August 15, 2026 AUG
Littleton, Colorado, United States
15AUG
ULTRA
Roxborough Ultras
Littleton, Colorado, United States
August 15, 2026 AUG
Colorado Springs, Colorado, United States
15AUG
21.1K
The Cheyenne Mountain Run
Colorado Springs, Colorado, United States
August 15, 2026 AUG
Westminster, Colorado, United States
15AUG
ULTRA
Westminster Trail Races
Westminster, Colorado, United States
August 15, 2026 AUG
Erie, Colorado, United States
16AUG
21.1K
Erie Half & 5k
Erie, Colorado, United States
August 16, 2026 AUG
Manitou Springs, Colorado, United States
16AUG
42.2K
Pikes Peak Marathon
Manitou Springs, Colorado, United States
August 16, 2026 AUG
Fraser, Colorado, United States
22AUG
21.1K
Byers Peak Stampede Half Marathon & 5K Run
Fraser, Colorado, United States
August 22, 2026 AUG
Leadville, Colorado, United States
22AUG
ULTRA
Leadville Trail 100 Run
Leadville, Colorado, United States
August 22, 2026 AUG
Pine, Colorado, United States
22AUG
42.2K
Staunton Rocks! Marathon and Half Marathon
Pine, Colorado, United States
August 22, 2026 AUG
Westminster, Colorado, United States
23AUG
21.1K
Pioneer Prairie Dog Half, 10k & 5k
Westminster, Colorado, United States
August 23, 2026 AUG
Steamboat Springs, Colorado, United States
29AUG
ULTRA
Continental Divide Trail Run
Steamboat Springs, Colorado, United States
August 29, 2026 AUG
Centennial, Colorado, United States
29AUG
21.1K
Sloth Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
August 29, 2026 AUG
Durango, Colorado, United States
29AUG
21.1K
TBK Bank Thirsty 13 Half Marathon
Durango, Colorado, United States
August 29, 2026 AUG
Denver, Colorado, United States
05SEP
21.1K
Golden Harvest Half Marathon & 5k/10k - Denver
Denver, Colorado, United States
September 5, 2026 SEP
Colorado Springs, Colorado, United States
06SEP
21.1K
Golden Harvest Half Marathon & 5k/10k - Colorado Springs
Colorado Springs, Colorado, United States
September 6, 2026 SEP
Parker, Colorado, United States
07SEP
21.1K
Labor Day Half Marathon
Parker, Colorado, United States
September 7, 2026 SEP
Idaho Springs, Colorado, United States
11SEP
ULTRA
Flaming Foliage Relay - Idaho Springs to Buena Vista
Idaho Springs, Colorado, United States
September 11, 2026 SEP
Bellvue, Colorado, United States
12SEP
ULTRA
Black Squirrel Half Marathon
Bellvue, Colorado, United States
September 12, 2026 SEP
Colorado, United States
12SEP
21.1K
NEDNED Trail Fest
Colorado, United States
September 12, 2026 SEP
Centennial, Colorado, United States
12SEP
21.1K
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
September 12, 2026 SEP
Granby, Colorado, United States
12SEP
ULTRA
Snow Mountain Ranch
Granby, Colorado, United States
September 12, 2026 SEP

List your marathon with verified details

Hosting a marathon in Colorado, United States? Submit the official source for free so runners can verify the race before they plan travel.

  • Free listing review
  • Official source verification
  • Runner-ready listing
  • Organizer dashboard

Already listed in Colorado, United States? Open the race and use Update listing. Missing event? Add it for free with the location prefilled.

Submit for review How review works

Cities

Place Marathons
Boulder 1
Denver 1
Leadville 1
Leadville 1
Manitou Springs 1
Manitou Springs 1

Planning notes for Colorado, United States

Use this region page to shortlist 100 upcoming races by date, distance, registration path, and official source.

  • Next raceSan Juan Softie 100 on August 14, 2026
  • Busy monthsSeptember (30), October (21), August (16)
  • DistancesMarathon, Half marathon, Ultra, 10K, 5K, Relay
  • VerifyOpen each race page, then confirm details from its official, registration, course-map, or source link.

← Back to United States