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41 marathons found for "Colorado", Half marathon, United States. Keep the list broad first, then tighten the filters when a race looks realistic.





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Colorado, United States
29SEP
42.2K
Center of the Nation Series - Day 2 (CO)
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
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
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
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
Westminster, Colorado, United States
11OCT
21.1K
Westy Half & 5k
Westminster, Colorado, United States
October 11, 2026 OCT
Denver, Colorado, United States
18OCT
42.2K
Denver Marathon
Denver, Colorado, United States
October 18, 2026 BQ Qualifier
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
Lone Tree, Colorado, United States
07NOV
21.1K
HRCA Backcountry Wilderness Half Marathon
Lone Tree, Colorado, United States
November 7, 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
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

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