1 aidUltramarathons in Illinois
As of October 6, 2026, Crewable lists 21 upcoming ultramarathons in Illinois from October 2026 to August 2027. The next is Arrowhead Endurance Run on October 10 in Johnston City. Registration is open for 2.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
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1 aidRace calendar
October 2026
5 racesNovember 2026
4 racesDecember 2026
1 raceJanuary 2027
1 raceMarch 2027
2 racesApril 2027
4 racesMay 2027
1 raceJune 2027
1 raceJuly 2027
1 raceAugust 2027
1 raceQuick answers
What is the next ultramarathon in Illinois?
Arrowhead Endurance Run, on Saturday, October 10, 2026, in Johnston City. Distances: 12 hr, 3 hr, 2.07 mi.
How many ultramarathons in Illinois have open registration?
2 of the 21 list registration as open as of October 6, 2026, including The Forge Trail Run Festival and American Bottoms.
What is the busiest month for ultramarathons in Illinois?
October 2026, with 5 of the 21. November 2026 follows with 4.
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