There are 36 ultras in Illinois scheduled for 2026. The next is the Chili Chase 5K Run and Kids Pepper Dash in Belleville on October 10. Illinois ultras run primarily October through September.

Train Up 5K and Fun Run

Sat, Oct 17 · Northfield, IL Northfield
1 Mile Fun Run/Walk | CHA Students 1st grade+1 Mile Fun Run/Walk | Adults, non-CHA students5K | CHA students 3rd grade+ +3

Cardio Kidz Costume Run

Sun, Oct 25 · Palatine, IL Palatine
Little Devil's 50-Yard Dash (Age 2)Spooky 100-Yard Sprint (Ages 4)Creepy 1/4 Mile Run (Kindergarten) +10