overwintering Boston ferns

Question

They will stay outside all writer, they are in hanging baskets, in a great place but I am concerned about our cold winter nights. We are in N CA. Will they like a frost blanket over them?

Answer 1

A frost blanket won't protect the roots which ultimately decides whether a plant makes it through the winter. Here in an article on overwintering boston fern.
https://www.gardeningknowhow.com/houseplants/boston-fern/overwintering-boston-ferns.htm