While the high firing temperature and quality of this Isidro 3-Piece Terracotta Pot Planter result in a durable and frost-resistant product, they still recommend that they are stored in a frost-free covered area in winter. If left outside, water may accumulate in the container and freeze, causing the planter to crack and break. Planters that must be left outside should be covered to prevent water, snow, and ice from accumulating inside the planter. Product Details Material: Terracotta Drainage Holes: Yes