Planting zones can be determined using the USDA Hardiness Zone Map. The planting zones, or The Unites States Department of Agriculture hardiness zones, are divided into 11 sections according to climate, with each zone either 10 degrees warmer or cooler than the next.
The USDA plant hardiness zone map is created to help growers identify the growing zone in which they are located so they can better determine what plants will grow well in their area. The map is divided into 11 different zones by color. Each zone represents a difference in climate temperature by 10 degrees warmer or cooler than the next. The interactive map uses users zip codes to determine the specific zone of the given location. When plants are purchased from retailers, they are marked with a zone rating to coincide with each specific area on the map.