Examples from the Web for frost-free
The length of the frost-free season has an important bearing upon the production of nuts after the trees are matured.
There are 180 to 215 frost-free days in the year, and summers are hot.
The number of frost-free days per year ranges from 198 to 206.
Begonias must be stored in sand or cocoanut-fibre in shallow boxes, and kept in a frost-free place through the winter.The Children's Book of Gardening|Mrs. Alfred Sidgwick