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30 marathons found for "Colorado", 5K, United States. Keep the list broad first, then tighten the filters when a race looks realistic.





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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
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
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
Durango, Colorado, United States
11OCT
42.2K
Durango Marathon
Durango, 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 Springs, Colorado, United States
17OCT
ULTRA
Bobcat Trail Races
Colorado Springs, Colorado, United States
October 17, 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
Golden, Colorado, United States
01NOV
21.1K
All-Out Kooky-Spooky
Golden, Colorado, United States
November 1, 2026 NOV
Littleton, Colorado, United States
07NOV
21.1K
Turkey Trails- Denver
Littleton, Colorado, United States
November 7, 2026 NOV
Colorado Springs, Colorado, United States
08NOV
21.1K
Turkey Trails - Colorado Springs
Colorado Springs, Colorado, United States
November 8, 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
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

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