Illinois · Ultra

2026-2027 Ultramarathons in Illinois

Every upcoming Ultra in Illinois, all 4 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

4 upcoming ultramarathons · 1 with finish-time stats

5K Races 26810K Races 76Half Marathons 57Marathons 7
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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.

Largest field124 finishersTour de Trailsin the 6 Miles

Illinois Ultramarathons by City

Lake Zurich 1Rockford 1Danville 1Cuba 1

The Next Ultra Marathons in Illinois

4 total
Sun, Nov 1, 2026Thankful Turkey 5K, 10K & Half Marathon Lake Zurich, IL5K10KHalf MarathonMarathonPricing TBADetails Sat, Dec 19, 2026Tour de Trails Rockford, IL3 Miles6 Miles9 Miles12 MilesFrom $80Details Sat, Feb 20, 2027Kennekuk Road Runners - Members Only Fat Ass Danville, IL28.4 MilesRegistration opens Nov 30FreeDetails Fri, Sep 3, 2027The Ultimate SUCK Cuba, IL50 Miles25 Miles10 MilesFrom $379Details

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 Oct 25, 2026.

Common Questions About Running an Ultra in Illinois

Which Illinois cities have the most ultramarathons?

Lake Zurich (1), Rockford (1), Danville (1), Cuba (1) lead the state for Ultra races. Those give you the most dates to choose from if your schedule is tight.