When in October are most 10K races held?
The busiest weekend in Colorado is October 2 and October 3, with 4 of them, 2 of those on Saturday, October 2. Every one of them is on a Saturday or a Sunday.
Race calendar · October 2027 · Colorado
10K Races in Colorado in October 2027
Every 10K in Colorado in October 2027, all 6 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
October 10K Races, By the Numbers
1:06:01Median finish time
41:26Median winning time
140Median field size
5October 10K races with published results
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Nov 12, 2026.
When in October
The October Race Weekends
10K races are not spread evenly across October. 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 October 10K in Colorado, from the most recent published results.
Colorado 10K Races by City in October
All 10K Runs in Colorado in October
6 total Sat, Oct 2, 2027Not So Flatt Breast Cancer Awareness Run/Walk - 5K & 10K Westminster, COFrom $40Details Sat, Oct 2, 2027Spooky Sprint - Denver Denver, COFrom $32Details Sun, Oct 3, 2027Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run Windsor, COFrom $50Details Sun, Oct 3, 2027Spooky Sprint - Colorado Springs Colorado Springs, COFrom $30Details Sun, Oct 24, 2027Ghosts and Goblins 5K Denver, COFrom $40Details Sun, Oct 31, 2027All-Out Kooky-Spooky Golden, COFrom $45Details
Common Questions About Running an October 10K in Colorado
What is a good 10K time?
Across the 5 of these October 10K races with published results from past editions, the median finisher ran 1:06:01, and the median winning time was 41:26. So anything under 1:06:01 puts you in the faster half of a typical field. That is the middle of these RunSignup fields, walkers and charity entrants included, not a national average.
How big is a typical October 10K field?
The median one finished 140 runners, across the 5 of these October 10K races with published results from past editions. Most are far smaller than the big-city events people picture, which means less crowding at the start and a friendlier field, with a last recorded finisher at 2:00:17.
Are there trail 10K races in Colorado in October?
Yes, one race around Colorado gets you off the pavement: 1 mixes road and trail.