Are there trail half marathons in Colorado in December?
Yes, 2 races around Colorado get you off the pavement: 1 is a trail race, and 1 mixes road and trail.
Race calendar · December 2026 · Colorado
Half Marathons in Colorado in December 2026
Every Half Marathon in Colorado in December 2026, all 6 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
When in December
The December Race Weekends
Half marathons are not spread evenly across December. Here is how the calendar actually falls, weekend by weekend, which is the part worth knowing before you book a trip or plan a taper around one.
By the numbers
The Biggest Field
The largest field of any December Half Marathon in Colorado, from the most recent published results.
Colorado Half Marathons by City in December
All Half Marathons in Colorado in December
6 total Sat, Dec 5, 2026All-Out Fa La La Westminster, COFrom $80Details Sun, Dec 6, 2026Rock Canyon Half Marathon- 40th Anniversary Run! Pueblo, COFrom $60Details Sat, Dec 12, 2026Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $45Register Sat, Dec 12, 2026Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $45Register Sat, Dec 26, 2026A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $50Register Sat, Dec 26, 2026New Year's Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $50Register