When in May are most 10K races held?
The busiest weekend in Illinois is May 1 and May 2, with 4 of them, 3 of those on Saturday, May 1. Every one of them is on a Saturday or a Sunday.
Race calendar · May 2027 · Illinois
10K Races in Illinois in May 2027
Every 10K in Illinois in May 2027, all 14 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
May 10K Races, By the Numbers
1:03:52Median finish time
38:55Median winning time
132Median field size
5May 10K 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 May
The May Race Weekends
10K races 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 10K in Illinois, from the most recent published results.
Illinois 10K Races by City in May
All 10K Runs in Illinois in May
14 total Sat, May 1, 2027Kirby Derby Monticello, ILRegistration opens Jan 1, 2027From $25Details Sat, May 1, 2027Byron Rocks 5k & 10k - Run it. Walk it. Ruck it. Byron, ILFrom $50Details Sat, May 1, 2027Northern Illinois Food Bank's Fight Hunger 5K I 10K I 1-Mile Wheaton, ILFrom $40Details Sun, May 2, 2027Chicagoland Spring Marathon, Half Marathon & 10K Schaumburg, ILFrom $40Details Sat, May 8, 2027Starved Rock Country Marathon Ottawa, ILFrom $60Details Sat, May 8, 2027Hometown Half Marathon/5K/10K - Greater Chicago Elk Grove Village,, ILFrom $38Details Sat, May 8, 2027Run for Chocolate 5k/10k/13.1 CHICAGO/EVANSTON Chicago, ILFrom $42Register Sun, May 16, 2027I Got Your Six Walk/Run Bourbonnais, ILRegistration opens Feb 4, 2027From $35Details Sat, May 22, 2027Frontline OCR Byron, ILFrom $79Details Sun, May 23, 2027Hitchhikers Spirits Run 5k/10k Joliet, ILFrom $35Details Sat, May 29, 2027Goose Creek Classic Odin, ILRegistration opens Mar 16, 2027From $25Details Sat, May 29, 2027WARRIOR RUSH: Clash of Olympus 5K - 10K - Half Marathon 13.1 - Full Marathon 26.2 Wheaton, ILFrom $40Details Sat, May 29, 2027SuperHeroes Run CHICAGO/EVANSTON Chicago, ILFrom $42Register Sat, May 29, 2027SuperHeroes Run SAN ANTONIO San Antonio, ILFrom $42Register
Common Questions About Running a May 10K in Illinois
What is a good 10K time?
Across the 5 of these May 10K races with published results from past editions, the median finisher ran 1:03:52, and the median winning time was 38:55. So anything under 1:03:52 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 10K field?
The median one finished 132 runners, across the 5 of these May 10K 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 2:05:00.