What are Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones?

Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones refer to defined geographic regions that can support specific plants, flowers and trees. The zones define a minimum range of temperatures that a plant or tree can survive safely in that zone. The most commonly used Hardiness Zones were defined by the USDA. The USDA provides a hard copy map that displays these zone throughout the US. The last update to this map covers minimum temperatures from 1961 to 1990. An updated map is currently in production, but has not been released yet. Plant Maps provides the only interactive version of the USDA hardiness zone map available on the internet.

Interactive USDA Gardening and Plant Hardiness Zone Map for California

USDA Zone 10a

USDA Zone 10b

USDA Zone 11a

USDA Zone 4b

USDA Zone 5b

USDA Zone 6a

USDA Zone 6b

USDA Zone 7a

USDA Zone 7b

USDA Zone 8a

USDA Zone 8b

USDA Zone 9a

USDA Zone 9b

What are Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones?

Zone Maps for Adjacent States

Other Interactive Gardening Maps and Data for California

Zoom to Major Cities in California

Interactive Maps of California Native Plants Distribution Areas