Whereas Western Washington plants used to state they were good for USDA zone 8B, they now say their apt for hardiness zone 9A. These zones are how the USDA determines which plants can successfully ...

The area of the county inside the I-295 loop and nearly all areas to the east of the loop are now in 9B. The western side of the county outside of the loop and to the west of I-95 remains in zone 9A.

Starting at the coast and moving north, Louisiana includes zone 10a (minimum temperature 30 to 35 degrees, Plaquemines Parish), zone 9b (minimum temperature 25 to 30 degrees), zone 9a (minimum ...