Casstown, Ohio is a small village located in Miami County with a humid continental climate. The summers are hot and humid, while the winters are cold and snowy. The village is situated near the Great Miami River, which provides water supply to the surrounding areas. Hydrology constituents in the area include nitrate, total phosphorus, and total suspended solids. There are several outdoor recreation opportunities in and around Casstown, including hiking, fishing, and hunting. The nearby Miami County Park system offers numerous trails and nature preserves for visitors to explore. Additionally, the Great Miami Riverway provides opportunities for boating, kayaking, and canoeing.