When should I sign up for a December Half Marathon?
As early as you can. 1 of these December Half Marathon races already have a price increase on the calendar, and 6 are open for entry right now.
Race calendar · December 2026 · Colorado
December 2026 Half Marathon Races in Colorado
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.
6 Half Marathon races in December 2026
When in December
The December Race Weekends
Half Marathon races do not spread evenly across December. The busiest weekend is December 5 and December 6, with 2 of them.
By the numbers
The Biggest and Longest-Running
The December Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
December Half Marathon Races by City
Soonest Half Marathon Races in December
6 total Sat, Dec 5, 2026All-Out Fa La La Westminster, COFrom $50Details Sun, Dec 6, 2026Rock Canyon Half Marathon- 40th Anniversary Run! Pueblo, COFrom $35Details Sat, Dec 12, 2026Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sat, Dec 12, 2026Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sat, Dec 26, 2026A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sat, Dec 26, 2026New Year's Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register
Common Questions About Running a December Half Marathon in Colorado
How much does a December Half Marathon cost to enter?
The typical entry is $30, with paid entries running from $30 up to $50. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
Are there trail Half Marathon races 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. Surfaces are not always published, so it is worth checking a specific race before you register.
Half Marathon Races in Other Months
November and January sit either side of December, which is where most people look next when a date does not fit.