Southwest: Including Colorado and the states to the west ... What changes were made in the 2023 USDA Plant Hardiness Zone map? For the first time since January 2012 and with the help of Oregon ...

Hardiness Zones 101 The USDA Plant Hardiness Zone Map consists of 13 individual zones that take in all of the contiguous United States, plus Alaska, Hawaii, and Puerto Rico. The first zone lies at ...