Which Illinois cities have the most Half Marathon races?
Chicago (34), Elk Grove Village (2), Shorewood (2), Mahomet (1) lead the state for Half Marathon races. Those give you the most dates to choose from if your schedule is tight.
Illinois · Half Marathon
Half Marathon Races in Illinois
Every upcoming Half Marathon in Illinois, all 56 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
56 upcoming Half Marathon races · 8 with finish-time stats
By the numbers
The Biggest and Longest-Running
The Illinois races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
Half Marathon Races by City
Soonest Half Marathon Races in Illinois
56 total Fri, Jul 31, 2026Run Mahomet Mahomet, ILFrom $15Details Sun, Aug 2, 2026Heatwave Half Marathon - Greater Chicago Elk Grove Village, ILFrom $22Details Sat, Aug 15, 2026RAMP River Run - 3K, 5K, & 1/2 Marathon Run Rockford, ILFrom $20Details Sat, Aug 15, 2026Run for PB& J 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Aug 15, 2026Bagel Run 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Aug 29, 2026Sloth Run 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Aug 29, 2026Run for Breast Cancer 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Sep 5, 2026Naperville Trails Half Marathon & 10K Wheaton, ILFrom $50Details Sat, Sep 12, 2026National Chocolate Day: Run for Chocolates 5K/10K/13.1 Chicago, ILFrom $30Register Sat, Sep 12, 2026Run for Mental Health 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Sep 19, 2026St. Jude Walk Bloomington, ILPricing TBADetails Sat, Sep 19, 2026Run Like A Diva Chicago, ILFrom $85Register
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 Jul 27, 2026.
Common Questions About Running a Half Marathon in Illinois
When are most Half Marathon races held in Illinois?
October is the busiest month for Half Marathon races in Illinois, with 13 of the 56, followed by September with 10. If you are flexible on the date, that is the quickest way to narrow things down.
How much do Illinois Half Marathon races cost?
Entry fees for Half Marathon races here run from $12.99 to about $95, depending on the event and how early you register.
How early should I register for a Half Marathon in Illinois?
8 of the 56 Half Marathon races in Illinois already have a price increase scheduled, so entry gets more expensive the longer you leave it. Race pricing almost always steps up as the date approaches, and signing up early is usually the cheapest option.
Are Illinois Half Marathon races beginner-friendly?
Yes, for the most part. Across the 7 Half Marathon races in Illinois with published results, the typical median finish is around 2:13:27, which means half of every one of those fields came in slower than that. Recreational runners and walk-runners are the bulk of these fields, not the exception.
Are there trail Half Marathon races in Illinois?
Yes, 2 races around Illinois get you off the pavement: 2 mix road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.