When in October are most 5K races held?
The busiest weekend in Colorado is October 2 and October 3, with 7 of them, 4 of those on Saturday, October 2. Every one of them is on a Saturday or a Sunday.
Race calendar · October 2027 · Colorado
5K Races in Colorado in October 2027
Every 5K in Colorado in October 2027, all 15 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
October 5K Races, By the Numbers
37:23Median finish time
19:26Median winning time
170Median field size
12October 5K 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
5K 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 and Longest-Running
The October 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
Colorado 5K Races by City in October
All 5K Runs in Colorado in October
15 total Sat, Oct 2, 2027Colorado Springs Marathon, Half, 5K, and Kids K Colorado Springs, COFrom $30Details Sat, Oct 2, 2027Not So Flatt Breast Cancer Awareness Run/Walk - 5K & 10K Westminster, COFrom $30Details Sat, Oct 2, 2027Spooky Sprint - Denver Denver, COFrom $32Details Sat, Oct 2, 2027The Extra Mile 5K Englewood, CORegistration opens Jan 11, 2027From $20Details Sun, Oct 3, 2027Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run Windsor, COFrom $40Details Sun, Oct 3, 2027Strides for Sierra 5K run/walk Arvada, CORegistration opens Aug 26, 2027From $35Details Sun, Oct 3, 2027Spooky Sprint - Colorado Springs Colorado Springs, COFrom $30Details Sat, Oct 9, 2027Manitou 5K Manitou Springs, COFrom $25Details Sun, Oct 10, 2027Westy Half & 5k Westminster, COFrom $39Details Sat, Oct 16, 2027Running Scared 5K/13K - Denver Littleton, COFrom $25Details Sun, Oct 17, 2027Running Scared 5K/13K - Colorado Springs Colorado Springs, COFrom $25Details Sun, Oct 24, 2027The 15th Annual Odyssey Odyssey - 2026 Denver, CORegistration opens Jun 6, 2027Pricing TBADetails Sun, Oct 24, 2027Ghosts and Goblins 5K Denver, COFrom $30Details Sat, Oct 30, 2027I Ain't Scared (of 5k) Thornton, COFrom $39Details Sun, Oct 31, 2027All-Out Kooky-Spooky Golden, COFrom $35Details
Common Questions About Running an October 5K in Colorado
What is a good 5K time?
Across the 12 of these October 5K races with published results from past editions, the median finisher ran 37:23, and the median winning time was 19:26. So anything under 37:23 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 5K field?
The median one finished 170 runners, across the 12 of these October 5K 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 1:19:59.
Are there trail 5K races in Colorado in October?
Yes, one race around Colorado gets you off the pavement: 1 mixes road and trail.