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

Saturday, October 2 - Sunday, October 3, 2021 Saint Charles, MO 63301 US Directions
Boston Qualifier


$95 10/03 7:30AM CDT Price increases after July 31, 2021 at 11:59pm CDT

Half Marathon

$75 10/03 7:30AM CDT Price increases after July 31, 2021 at 11:59pm CDT
2-Person Teams

Half Marathon Relay

$60 10/03 7:30AM CDT Price increases after July 31, 2021 at 11:59pm CDT
New! Saturday Event


$45 10/02 5:00PM CDT Price increases after August 31, 2021 at 11:59pm CDT
New! Saturday Youth Event

Mini Moo Mile

$25 10/02 4:00PM CDT Price increases after September 30, 2021 at 11:59pm CDT
2017/2018/2019 or 2021 Medal

Virtual Runner

$35 Registration ends October 2, 2021 at 4:00pm CDT

Don't miss the fun and excitement of the MO' Cowbell Race on October 2-3, 2021!  Two event to choose from on Saturday evening, the 5K and the Mini Moo One Mile Fun Run and three events to choose from on Sunday morning, the Marathon, the Half-Marathon or the Half-Marathon Relay.  Flat & fast courses, perfect for beginners or those who want to set a new personal best!

Marathon, Half-Marathon, Marathon-Relay Participants, looking for an additional CHALLENGE for MO' Cowbell Weekend?  Add the Saturday Evening 5K to your Sunday event during registration and receive special swag for completing the WEEKEND CHALLENGE.

Registration for the 5K, Marathon, Half-Marathon or the Marathon Relay includes:

  • Full-Zip Jacket
  • One of-a-Kind Finisher Medal
  • Free and convenient parking
  • Free downloadable photos for all participants
  • Great pace team in the Half and Relay
  • Family friendly post race party on Saturday evening and Sunday morning with lots of food, fun and music.

Registration for the Mini Moo Mile includes:

  • Custom Short Sleeve Youth Shirt
  • Commemorative Finisher Award

Registration for the Virtual Run includes:

  • Your choice of a 2017, 2018, 2019 or 2021 One-Of-A-Kind Finisher Medal
  • Shipping and handling of your medal to you


Race Website

Additional race information can be found at

Race Contact Info

If you have any questions about this race, click the button below.


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