Because the state is so large, it is actually divided into northern and southern planting zones. The northern half of a California plantation zone can be between 5a and 10b. The southern region has zones 5a to 11a. Planting zones help determine when and what to plant during the year. The USDA plant hardiness zone map is the standard by which gardeners and growers can determine which perennials are most likely to thrive in a location.
The map is based on the average annual extreme minimum temperature for winter, which is shown in areas of 10 degrees F and half zones of 5 degrees F. A broadband Internet connection is recommended for the interactive GIS-based map shown above. Based on the 1990 USDA hardiness zone map, this interactive version covers the state of California, ranging from USDA zone 4b to USDA zone 11a. Because it's such a large state, California's hardiness zone maps cover a wide range of temperatures and are divided into two sections.
To find the California plantation area where you live, simply search for the area on the maps below and match the color of that area with the legend of the map that appears on the right or left. California has an enormous diversity of growing areas, ranging from the icy mountainous area 5a to the subtropical areas of SoCal 11a. Most of the state has a temperate Mediterranean-like climate, making it perfect for growing fruit trees, nuts, wine grapes, vegetables, herbs and an enormous variety of livestock.
