When in June are most 5K races held?
The busiest weekend in Colorado is June 19 and June 20, with 6 5K races on those two days, and the single busiest day is Saturday, June 19 with 4. Every one of them is on a Saturday or a Sunday.
Race calendar · June 2027 · Colorado
June 2027 5K Races in Colorado
Every 5K in Colorado in June 2027, all 10 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
10 5K races in June 2027
What the field actually runs
June 5K Races, By the Numbers
37:17Median finish time
19:40Median winning time
168Median field size
8June 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 Sep 22, 2026.
When in June
The June Race Weekends
5K races do not spread evenly across June. The busiest weekend is June 19 and June 20, with 6 of them.
By the numbers
The Biggest and Longest-Running
The June 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
June 5K Races by City
Soonest 5K Races in June
10 total Sun, Jun 6, 2027Colorado 13er (Half Marathon/10k/5k) Louisville, COFrom $35Details Sun, Jun 6, 2027Flamingo Day 5K Denver, COFrom $30Details Sat, Jun 12, 2027All-Out Summer Breeze Arvada, COFrom $35Details Sat, Jun 12, 2027Alpha 5K Challenge Boulder, CORegistration closedPricing TBAView race Sat, Jun 19, 2027Red, White and Brew 5k, 10k & Half Marathon Windsor, COFrom $18Details Sat, Jun 19, 2027Unicorn 5k (North) Thornton, COFrom $41Details Sat, Jun 19, 2027Treat Trot - Denver Denver, COFrom $22Details Sat, Jun 19, 2027Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sun, Jun 20, 2027Father's Day Classic 10k, 5k, & 1 Mile Arvada, COFrom $12Details Sun, Jun 20, 2027Treat Trot Colorado Springs Colorado Springs, COFrom $22Details
Common Questions About Running a June 5K in Colorado
When should I sign up for a June 5K?
As early as you can. 6 of these June 5K races already have a price increase on the calendar, and 9 are open for entry right now.
How much does a June 5K cost to enter?
The typical entry is $30, with paid entries running from $12 up to $41. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
What is a good 5K time?
Across the 8 of these June 5K races with published results from past editions, the median finisher ran 37:17, and the median winning time was 19:40. So anything under 37:17 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 June 5K field?
The median one finished 168 runners, across the 8 of these June 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 1:10:30.
Are there trail 5K races in Colorado in June?
Yes, one race around Colorado gets you off the pavement: 1 mixes road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.
5K Races in Other Months
May and July sit either side of June, which is where most people look next when a date does not fit.