Here are some: Summer (April to October): During the summer months, Prague Castle is typically open for visitors from early morning until late afternoon or early evening. The main castle grounds, including St. Vitus Cathedral and the Old Royal Palace may close around 6:00 PM or 7:00 PM. Winter (November to March): In the winter season the opening hours may be shorter, and the castle complex may close earlier in the afternoon typically around 4:00 PM or 5:00 PM.