When in December are most 10K races held?
The busiest weekend in Colorado is December 5 and December 6, with 3 10K races on those two days, and the single busiest day is Saturday, December 12 with 3. Every one of them is on a Saturday or a Sunday.
Race calendar · December 2026 · Colorado
December 2026 10K Races in Colorado
Every 10K in Colorado in December 2026, all 8 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
8 10K races in December 2026
When in December
The December Race Weekends
10K races do not spread evenly across December. The busiest weekend is December 5 and December 6, with 3 of them.
By the numbers
The Biggest and Longest-Running
The December 10K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
December 10K Races by City
Soonest 10K Races in December
8 total Sat, Dec 5, 2026All-Out Fa La La Westminster, COFrom $50Details Sat, Dec 5, 2026Candy Cane Course - Colorado Springs Colorado Springs, COFrom $27Details Sun, Dec 6, 2026Candy Cane Course - Denver Westminster, COFrom $27Details Sat, Dec 12, 2026Santa Catch 5k & 10k Windsor, COFrom $15Details 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 10K in Colorado
When should I sign up for a December 10K?
As early as you can. 1 of these December 10K races already have a price increase on the calendar, and 8 are open for entry right now.
How much does a December 10K cost to enter?
The typical entry is $30, with paid entries running from $15 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 10K 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.
10K 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.