There are 33 ultras in Illinois scheduled for 2026. The next is the Cantigny 5K Run/Walk 2026 - Benefiting The Midwest Shelter for Homeless Veterans in Wheaton on October 17. 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