MO Cowbell Marathon – Half – 5K – 10k

The MO Cowbell marathon and 5k will be held on Sunday, October 5, 2025.

This race is expected to draw in over 5,000 runners and just as many spectators, making it an extremely popular event year-after-year in St. Charles County and St. Louis.

The course follows much of the Katy Trail near the St. Charles Trailhead which offers shopping, great food, and lodging nearby.

A post race party will be held in Frontier Park and offer participants post-race refreshments including chocolate milk, bananas, chips, beer and more! Additionally, music, vendors, and a kid zone make this a great family event!

Where can I find more information about the MO Cowbell Marathon?

You can visit the event site at mocowbellmarathon.com

When can I register for the MO Cowbell Marathon?

Registration is open for 2025. Visit the event registration page at mocowbellmarathon.com/registration

Where can I stay for the MO Cowbell Marathon?

Lodging option can be found on our Saint Charles Lodging page.