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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
Canon City, Colorado, United States
03OCT
21.1K
Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon
Canon City, Colorado, United States
October 3, 2026 OCT
Littleton, Colorado, United States
03OCT
21.1K
Spooky Sprint - Denver
Littleton, Colorado, United States
October 3, 2026 OCT
Crawford, Colorado, United States
03OCT
42.2K
West Elk Challenge
Crawford, Colorado, United States
October 3, 2026 OCT
Boulder, Colorado, United States
04OCT
42.2K
Boulder Marathon
Boulder, Colorado, United States
October 4, 2026 BQ Qualifier
Windsor, Colorado, United States
04OCT
42.2K
Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run
Windsor, Colorado, United States
October 4, 2026 OCT
Centennial, Colorado, United States
10OCT
21.1K
Bagel Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
October 10, 2026 OCT
Breckenridge, Colorado, United States
10OCT
42.2K
Breckenridge RunFest
Breckenridge, Colorado, United States
October 10, 2026 OCT
Pine, Colorado, United States
10OCT
ULTRA
Suffer Better 10th Annual Fall Trail Runs
Pine, Colorado, United States
October 10, 2026 OCT
Fort Collins, Colorado, United States
10OCT
42.2K
The Long View Marathon
Fort Collins, Colorado, United States
October 10, 2026 OCT
Breckenridge, Colorado, United States
11OCT
42.2K
Breckenridge Road Marathon
Breckenridge, Colorado, United States
October 11, 2026 OCT
Durango, Colorado, United States
11OCT
42.2K
Durango Marathon
Durango, Colorado, United States
October 11, 2026 OCT
Colorado, United States
11OCT
ULTRA
Run the Rocks Park and Amphitheatre
Colorado, United States
October 11, 2026 OCT
Westminster, Colorado, United States
11OCT
21.1K
Westy Half & 5k
Westminster, Colorado, United States
October 11, 2026 OCT
Colorado, United States
17OCT
42.2K
Blue Sky Marathon
Colorado, United States
October 17, 2026 OCT
Colorado Springs, Colorado, United States
17OCT
ULTRA
Bobcat Trail Races
Colorado Springs, Colorado, United States
October 17, 2026 OCT
Denver, Colorado, United States
18OCT
42.2K
Denver Marathon
Denver, Colorado, United States
October 18, 2026 BQ Qualifier
Colorado, United States
19OCT
ULTRA
Blue Sky Trail Marathon
Colorado, United States
October 19, 2026 OCT
Centennial, Colorado, United States
31OCT
21.1K
PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
October 31, 2026 OCT
Colorado Springs, Colorado, United States
31OCT
21.1K
Spooky Sprint - Colorado Springs
Colorado Springs, Colorado, United States
October 31, 2026 OCT
Golden, Colorado, United States
01NOV
21.1K
All-Out Kooky-Spooky
Golden, Colorado, United States
November 1, 2026 NOV
Fruita, Colorado, United States
01NOV
ULTRA
Rim Rock Marathon
Fruita, Colorado, United States
November 1, 2026 NOV
Fort Collins, Colorado, United States
07NOV
ULTRA
Colorado 24 Hour Run
Fort Collins, Colorado, United States
November 7, 2026 NOV
Lone Tree, Colorado, United States
07NOV
21.1K
HRCA Backcountry Wilderness Half Marathon
Lone Tree, Colorado, United States
November 7, 2026 NOV
Fruita, Colorado, United States
07NOV
ULTRA
Kessel Run Ultra
Fruita, Colorado, United States
November 7, 2026 NOV

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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.

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