When in May are most Half Marathon races held?
The busiest weekend in Missouri is May 1 and May 2, with 5 Half Marathon races on those two days, and the single busiest day is Saturday, May 1 with 4. Every one of them is on a Saturday or a Sunday.
Race calendar · May 2027 · Missouri
May 2027 Half Marathon Races in Missouri
Every Half Marathon in Missouri in May 2027, all 8 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
8 Half Marathon races in May 2027
What the field actually runs
May Half Marathon Races, By the Numbers
2:13:22Median finish time
1:20:57Median winning time
93Median field size
5May 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 May
The May Race Weekends
Half Marathon races do not spread evenly across May. The busiest weekend is May 1 and May 2, with 5 of them.
By the numbers
The Biggest and Longest-Running
The May Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
May Half Marathon Races by City
Soonest Half Marathon Races in May
8 total Sat, May 1, 2027The Bluffs Trail Runs Eminence, MOFrom $15Details Sat, May 1, 2027Drink MO Wine Run - 1 Mile, 5K, 10K & Half Marathon Augusta, MOFrom $35Details Sat, May 1, 2027Hometown Half Marathon/5K/10K - Kansas City Kansas City, MOFrom $22Details Sat, May 1, 2027The SPRING SPRUNG 5k-10k 10K Ruck and Half Marathon Ballwin, MOFrom $39Details Sun, May 2, 2027Hometown Half Marathon/5K/10K - St Louis St Louis, MOFrom $22Details Sat, May 8, 2027Medal Madness 5K, 10K, & 13.1M at Branson, MO (18) Branson, MOFrom $30Details Sat, May 8, 2027Run for Chocolate 5k/10k/13.1 KANSAS CITY Kansas City, MOFrom $30Register Sat, May 22, 2027Hospital Hill Run Kansas City, MOFrom $37Details
Common Questions About Running a May Half Marathon in Missouri
When should I sign up for a May Half Marathon?
As early as you can. 3 of these May Half Marathon races already have a price increase on the calendar, and 8 are open for entry right now.
How much does a May Half Marathon cost to enter?
The typical entry is $30, with paid entries running from $15 up to $39. 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 5 of these May Half Marathon races with published results from past editions, the median finisher ran 2:13:22, and the median winning time was 1:20:57. So anything under 2:13:22 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 May Half Marathon field?
The median one finished 93 runners, across the 5 of these May 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 3:25:22.
Are there trail Half Marathon races in Missouri in May?
Yes, 2 races around Missouri get you off the pavement: 2 are trail races. Surfaces are not always published, so it is worth checking a specific race before you register.
Half Marathon Races in Other Months
April and June sit either side of May, which is where most people look next when a date does not fit.