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Marathons in Colorado, United States

99 upcoming marathons listed in Colorado across 6 cities. Next: Leadville Trail 100 Run on August 15, 2026.

99marathons upcoming
6cities
August 15, 2026Next race
Marathon, Half marathon, Ultra, 10K, 5K, RelayDistances
Colorado Springs, Colorado, United States
08NOV
21.1K
Turkey Trails - Colorado Springs
Colorado Springs, Colorado, United States
November 8, 2026 NOV
Colorado, United States
09NOV
42.2K
Southwest Series - Day 2 (CO)
Colorado, United States
November 9, 2026 NOV
Durango, Colorado, United States
09NOV
42.2K
Southwest Series - CO
Durango, Colorado, United States
November 9, 2026 NOV
Louisville, Colorado, United States
14NOV
21.1K
Louisville Trail Race
Louisville, Colorado, United States
November 14, 2026 NOV
Centennial, Colorado, United States
14NOV
21.1K
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
November 14, 2026 NOV
Arvada, Colorado, United States
21NOV
21.1K
TURKEY TREK (13.1, 10k, 5k & 2k)
Arvada, Colorado, United States
November 21, 2026 NOV
Centennial, Colorado, United States
28NOV
21.1K
Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
November 28, 2026 NOV
Westminster, Colorado, United States
05DEC
21.1K
All-Out Fa La La
Westminster, Colorado, United States
December 5, 2026 DEC
Durango, Colorado, United States
05DEC
42.2K
Four Corners Quad Keyah Marathon - Day 3
Durango, Colorado, United States
December 5, 2026 DEC
Pine, Colorado, United States
05DEC
ULTRA
Sawmill Trail Runs
Pine, Colorado, United States
December 5, 2026 DEC
Pueblo, Colorado, United States
06DEC
42.2K
Rock Canyon Half Marathon- 40th Anniversary Run!
Pueblo, Colorado, United States
December 6, 2026 DEC
Centennial, Colorado, United States
12DEC
42.2K
Sunrise Marathon 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
December 12, 2026 DEC
Centennial, Colorado, United States
26DEC
21.1K
New Year's Run 5K/10K/13.1 DENVER/AURORA
Centennial, Colorado, United States
December 26, 2026 DEC
Arvada, Colorado, United States
09JAN
21.1K
All-Out Polar Prowl
Arvada, Colorado, United States
January 9, 2027 JAN
Arvada, Colorado, United States
06FEB
21.1K
All-Out Mardi Crawl
Arvada, Colorado, United States
February 6, 2027 FEB
Colorado Springs, Colorado, United States
06FEB
ULTRA
Stories Trail Runs
Colorado Springs, Colorado, United States
February 6, 2027 FEB
Salida, Colorado, United States
13MAR
ULTRA
22nd Annual Run Through Time Trail Marathon and Half Marathon
Salida, Colorado, United States
March 13, 2027 MAR
Golden, Colorado, United States
21MAR
21.1K
All-Out Spring Fever
Golden, Colorado, United States
March 21, 2027 MAR
Colorado, United States
09APR
ULTRA
Trail Running Festival Desert Rats by UTMB®
Colorado, United States
April 9, 2027 to April 11, 2027 APR
Colorado Springs, Colorado, United States
10APR
ULTRA
Rattler Trail Race
Colorado Springs, Colorado, United States
April 10, 2027 APR
Littleton, Colorado, United States
11APR
21.1K
Platte River Half-Marathon, Relay & 5k
Littleton, Colorado, United States
April 11, 2027 APR
Westminster, Colorado, United States
24APR
21.1K
All-Out Beat the Heat
Westminster, Colorado, United States
April 24, 2027 APR
Brighton, Colorado, United States
24APR
ULTRA
Runs With Scissors Races
Brighton, Colorado, United States
April 24, 2027 APR
Larkspur, Colorado, United States
01MAY
ULTRA
Greenland Trail Races
Larkspur, Colorado, United States
May 1, 2027 MAY

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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 99 upcoming races by date, distance, registration path, and official source.

  • Next raceLeadville Trail 100 Run on August 15, 2026
  • Busy monthsSeptember (30), October (21), August (15)
  • 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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