When in May are most half marathons held?
The busiest weekend in Missouri is May 1 and May 2, with 6 of them, 5 of those on Saturday, May 1. Every one of them is on a Saturday or a Sunday.
Race calendar · May 2027 · Missouri
Half Marathons in Missouri in May 2027
Every Half Marathon in Missouri in May 2027, all 13 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
May Half Marathons, By the Numbers
2:13:22Median finish time
1:20:57Median winning time
93Median field size
5May half marathons 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 May
The May Race Weekends
Half marathons are not spread evenly across May. 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 May Half Marathon in Missouri, from the most recent published results.
Missouri Half Marathons by City in May
All Half Marathons in Missouri in May
13 total Sat, May 1, 2027Muddy River Half Marathon Cape Girardeau, MOFrom $60Details Sat, May 1, 2027The Bluffs Trail Runs Eminence, MOFrom $85Details Sat, May 1, 2027Drink MO Wine Run - 1 MILE, 5K, 10K & HALF MARATHON Augusta, MOFrom $70Details Sat, May 1, 2027Hometown Half Marathon/5K/10K - Kansas City Kansas City, MOFrom $54Details Sat, May 1, 2027The SPRING SPRUNG 5k-10k 10K Ruck and Half Marathon Ballwin, MOFrom $69Details Sun, May 2, 2027Hometown Half Marathon/5K/10K - St Louis St Louis, MOFrom $56Details Sat, May 8, 2027Capital City Race Jefferson City, MOFrom $59Details Sat, May 8, 2027Medal Madness 5K, 10K, & 13.1M at Branson, MO (19) Branson, MOFrom $65Details Sat, May 8, 2027Run for Chocolate 5k/10k/13.1 KANSAS CITY Kansas City, MOFrom $45Register Sat, May 15, 2027Love to Run St. Charles - 5K Saint Charles, MOFrom $70Details Sat, May 22, 2027Hospital Hill Run Kansas City, MOFrom $87Details Sat, May 22, 2027Squirrel 5K, 10K, & 13.1M at Branson, MO (21) Branson, MOFrom $65Register Sat, May 29, 2027SuperHeroes Run KANSAS CITY Kansas City, MOFrom $45Register
Common Questions About Running a May Half Marathon in Missouri
What is a good Half Marathon time?
Across the 5 of these May half marathons 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 marathons 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 marathons in Missouri in May?
Yes, 2 races around Missouri get you off the pavement: 2 are trail races.