Only until race start! Register! Saturday, April 20, 2019

Click here to REGISTER NOW!

Click here to CONFIRM ENTRY!

We are pleased to announce the 5th annual Sly Fox Half Madness and 10K held on April 20, 2019. The race starts and finishes in historical and scenic St. Charles IL. Targeted to be the race that kicks off your race season. The Madness Crew was determined to satisfy the hard-core runner and amateurs with a challenging 13.1 and 10K. From the organizers of the Half Madness Half Madness 13.1 ( in Batavia IL.


Cedar St. and 3rd, Downtown St. Charles IL (Behind Alley 64)

Registration Fees

Sly Fox Half Madness
     Now - January 31 - $60
     February 1 - February 28 $70
     March 1 - March 31 - $80
     April 1 - April 14th - $90
     April 15th- Race Day- $100
     Now- January 31 - $40
     February 1 - February 28 - $50
     March 1 - March 31 - $60
     April 1 - April 14th - $70
     April 15th -Race Day- $80
The 10K sold out quickly last year so it is advised that you register early!

Sign Up


All registrations are being handled through
We are expecting to fill our field capacity so please sign up quickly to ensure your slot! We look forward to seeing you!
Privacy & Refund Policy