Ready to race? Register directly on the official race website — opens in a new tab.
Register →Save this race to your wishlist, set a registration reminder, and build a full training plan on Trehko.
MO' Cowbell Marathon/Half-Marathon/10K/5K is a half marathon running event held in Saint Charles, MO on Nov 8, 2026. It is a Boston Marathon qualifier. The course offers a fast, PR-friendly route.
Trehko tracks registration status, entry fees, and deadlines for MO' Cowbell Marathon/Half-Marathon/10K/5K and thousands of other endurance races. Use the app to set a registration reminder and build a training plan tailored to race day.
Browse by discipline: