I wonder if it's open year-round?

Yes, it is! And it is a beautiful place to boot! Corning is easy to get to, and the factory has an admission price under $10. We have been there many times and it always fascinates me. I watched a glass worker with a solid rod of glass create a teddy bear. After the demonstration, and after a cooling period, my husband purchased that same teddy bear for a small fee. It is something I will always treasure as a gift from him on our honeymoon.