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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
Loma, Colorado, United States
12SEP
42.2K
Steele Trap Trail Run
Loma, Colorado, United States
September 12, 2026 SEP
Buena Vista, Colorado, United States
12SEP
21.1K
Trail Sisters Women's Half Marathon & 10k
Buena Vista, Colorado, United States
September 12, 2026 SEP
Colorado, United States
13SEP
21.1K
Colorado Mountain Half+ Series 2026
Colorado, United States
September 13, 2026 SEP
Centennial, Colorado, United States
13SEP
21.1K
Nun Run
Centennial, Colorado, United States
September 13, 2026 SEP
Denver, Colorado, United States
13SEP
42.2K
Sloan's Lake Search Party (SLSP) Marathon Hourly Loop Race!
Denver, Colorado, United States
September 13, 2026 SEP
Westminster, Colorado, United States
19SEP
21.1K
All-Out Fall Fest
Westminster, Colorado, United States
September 19, 2026 SEP
Buena Vista, Colorado, United States
19SEP
21.1K
Autumn Run
Buena Vista, Colorado, United States
September 19, 2026 SEP
Beulah, Colorado, United States
19SEP
42.2K
Beulah Challenge and OverIt Series
Beulah, Colorado, United States
September 19, 2026 SEP
Manitou Springs, Colorado, United States
19SEP
ULTRA
Pikes Peak Ascent
Manitou Springs, Colorado, United States
September 19, 2026 SEP
Glenwood Springs, Colorado, United States
19SEP
42.2K
The Sunlight Showdown
Glenwood Springs, Colorado, United States
September 19, 2026 SEP
Fort Collins, Colorado, United States
20SEP
42.2K
Fall Equinox
Fort Collins, Colorado, United States
September 20, 2026 SEP
Manitou Springs, Colorado, United States
20SEP
42.2K
Pikes Peak Marathon
Manitou Springs, Colorado, United States
September 20, 2026 SEP
Red Feather Lakes, Colorado, United States
25SEP
ULTRA
Red Feather Trail Jamboree
Red Feather Lakes, Colorado, United States
September 25, 2026 SEP
Telluride, Colorado, United States
26SEP
42.2K
Deep Creek Trail Half Marathon
Telluride, Colorado, United States
September 26, 2026 SEP
Estes Park, Colorado, United States
26SEP
ULTRA
Estes Epic
Estes Park, Colorado, United States
September 26, 2026 SEP
Centennial, Colorado, United States
26SEP
21.1K
Oktoberfest Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
September 26, 2026 SEP
Colorado Springs, Colorado, United States
26SEP
ULTRA
Outlast Colorado Springs
Colorado Springs, Colorado, United States
September 26, 2026 SEP
La Veta, Colorado, United States
26SEP
ULTRA
WILD Wahatoya Runs
La Veta, Colorado, United States
September 26, 2026 SEP
Colorado, United States
27SEP
ULTRA
Boulderthon
Colorado, United States
September 27, 2026 SEP
Boulder, Colorado, United States
27SEP
42.2K
Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado
Boulder, Colorado, United States
September 27, 2026 SEP
Colorado, United States
29SEP
42.2K
Center of the Nation Series - Day 2 (CO)
Colorado, United States
September 29, 2026 SEP
Sterling, Colorado, United States
29SEP
42.2K
Center of the Nation - CO
Sterling, Colorado, United States
September 29, 2026 SEP
Colorado Springs, Colorado, United States
03OCT
42.2K
Colorado Springs Marathon, Half, 5K, and Kids K
Colorado Springs, Colorado, United States
October 3, 2026 OCT
Littleton, Colorado, United States
03OCT
ULTRA
Outlast Denver
Littleton, Colorado, United States
October 3, 2026 OCT

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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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