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.
Casper Marathon is a marathon running event held in Casper, WY on Jun 7, 2026. It draws 300 competitors and is a Boston Marathon qualifier. The course features rolling hills.
Trehko tracks registration status, entry fees, and deadlines for Casper Marathon 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: