MO' Cowbell Marathon/Half-Marathon/Half-Marathon Relay/5K

Saturday, October 2 - Sunday, October 3, 2021 Saint Charles, MO 63301 US Directions
2020 Deferral Info

You can complete your deferral and register for ANY event in the 2021 MO' Cowbell.  

  • You can register for the same event or a 2021 event with a lower entry fee at no cost. Refunds are not available when transferring to an event with a lower entry fee  
  • You also have the option of upgrading to a 2021 event with a higher entry fee and pay the difference between the 2021 entry fee and your deferral credit.
  • The deferral credit is only applicable toward the event registration cost

Click HERE for instructions how to claim your Deferred Registration.  Deadline for Deferral Transfers is September 1, 2021.


We use cookies to offer you a better browsing experience. Read how we use cookies and how you can control them by visiting our Privacy Policy. If you continue to use this site, you consent to use all cookies.