When should I sign up for a June Half Marathon?
As early as you can. 4 of these June Half Marathon races already have a price increase on the calendar, and 5 are open for entry right now.
Race calendar · June 2027 · Colorado
June 2027 Half Marathon Races in Colorado
Every Half Marathon in Colorado in June 2027, all 5 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
5 Half Marathon races in June 2027
What the field actually runs
June Half Marathon Races, By the Numbers
2:14:20Median finish time
1:20:41Median winning time
146Median field size
4June Half Marathon 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
Half Marathon races do not spread evenly across June. The busiest weekend is June 5 and June 6, with 2 of them.
By the numbers
The Biggest and Longest-Running
The June Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
June Half Marathon Races by City
Soonest Half Marathon Races in June
5 total Sun, Jun 6, 2027Colorado 13er (Half Marathon/10k/5k) Louisville, COFrom $35Details Sun, Jun 6, 2027The Steamboat Marathon Steamboat Springs, COFrom $65Details Sat, Jun 12, 2027All-Out Summer Breeze Arvada, COFrom $35Details Sat, Jun 19, 2027Red, White and Brew 5k, 10k & Half Marathon Windsor, COFrom $18Details Sat, Jun 19, 2027Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register
Common Questions About Running a June Half Marathon in Colorado
How much does a June Half Marathon cost to enter?
The typical entry is $35, with paid entries running from $18 up to $65. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
What is a good Half Marathon time?
Across the 4 of these June Half Marathon races with published results from past editions, the median finisher ran 2:14:20, and the median winning time was 1:20:41. So anything under 2:14:20 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 Half Marathon field?
The median one finished 146 runners, across the 4 of these June Half Marathon 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 4:12:48.
Are there trail Half Marathon 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.
Half Marathon 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.