When in August are most 5K races held?
The busiest weekend in Colorado is August 7 and August 8, with 5 of them, 4 of those on Saturday, August 7. One more falls on a weekday, which is worth knowing if you are traveling for it.
Race calendar · August 2027 · Colorado
5K Races in Colorado in August 2027
Every 5K in Colorado in August 2027, all 9 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
August 5K Races, By the Numbers
37:15Median finish time
18:06Median winning time
157Median field size
7August 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 August
The August Race Weekends
5K races are not spread evenly across August. 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 August 5K in Colorado, from the most recent published results.
Colorado 5K Races by City in August
All 5K Runs in Colorado in August
9 total Sat, Aug 7, 2027Unicorn 5k (South) Highlands Ranch, COFrom $44Details Sat, Aug 7, 2027Summer Sizzler- Denver Denver, COFrom $32Details Sat, Aug 7, 2027All-Out Runapalooza Arvada, COFrom $35Details Sat, Aug 7, 2027RoC & Roll 5K: Run, Walk, or Wheel Fountain, COFrom $43Details Sun, Aug 8, 2027Summer Sizzler- Colorado Springs Colorado Springs, COFrom $30Details Sun, Aug 15, 2027Erie Half & 5k Erie, COFrom $39Details Mon, Aug 16, 2027James Test Site Lyons, CORegistration opens Jan 30, 2027FreeDetails Sat, Aug 21, 2027Ram Run 5K Denver, COFrom $20Details Sun, Aug 22, 2027Pioneer Prairie Dog Half, 10k & 5k Westminster, COFrom $39Details
Common Questions About Running an August 5K in Colorado
What is a good 5K time?
Across the 7 of these August 5K races with published results from past editions, the median finisher ran 37:15, and the median winning time was 18:06. So anything under 37:15 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 August 5K field?
The median one finished 157 runners, across the 7 of these August 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 1:08:31.