Zone 1: over 6000 feet elevation, corresponds to USDA zone 7 or colder, Sunset National Garden zone 1
Zone 2: at 4000 to 6000 feet elevation, corresponds to USDA zone 7b and 8a, Sunset National Garden zone 2
Zone 3: at 3500 to 5000 feet elevation, corresponds to USDA zone 8b, Sunset National Garden zone 10
Zone 4: at 2000 to 4000 feet elevation, corresponds to USDA zone 9a, Sunset National Garden zone 12
Zone 5: at 1000 to 2000 feet elevation, corresponds to USDA zone 9b, Sunset National Garden zone 13
Zone 6: below 1000 feet elevation, and in the warmer areas of the Phoenix metropolitan area, corresponds to USDA zone 10, and the warmest areas of Sunset National Garden zone 13

Sources: Material written by Elizabeth Davison

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