Growing zones by state
| State | USDA zones across its ZIP codes |
|---|---|
| Alabama | Zones 7b to 9b |
| Alaska | Zones 1a to 8b |
| Arizona | Zones 5b to 10a |
| Arkansas | Zones 7a to 8b |
| California | Zones 5b to 11a |
| Colorado | Zones 4a to 7a |
| Connecticut | Zones 6a to 7b |
| Delaware | Zones 7b to 8a |
| District of Columbia | Zones 7b to 8a |
| Florida | Zones 8b to 11b |
| Georgia | Zones 7b to 9a |
| Hawaii | Zones 10b to 13a |
| Idaho | Zones 4a to 7b |
| Illinois | Zones 5a to 7a |
| Indiana | Zones 5b to 7a |
| Iowa | Zones 4b to 6a |
| Kansas | Zones 5b to 7a |
| Kentucky | Zones 6b to 7b |
| Louisiana | Zones 8b to 10a |
| Maine | Zones 3b to 7a |
| Maryland | Zones 6a to 8a |
| Massachusetts | Zones 5b to 7b |
| Michigan | Zones 4a to 7a |
| Minnesota | Zones 3a to 5a |
| Mississippi | Zones 7b to 9a |
| Missouri | Zones 5b to 8a |
| Montana | Zones 3b to 6b |
| Nebraska | Zones 5a to 6a |
| Nevada | Zones 5a to 9b |
| New Hampshire | Zones 4a to 6b |
| New Jersey | Zones 6b to 8a |
| New Mexico | Zones 5a to 8b |
| New York | Zones 4a to 7b |
| North Carolina | Zones 6b to 9a |
| North Dakota | Zones 3b to 4b |
| Ohio | Zones 6a to 7a |
| Oklahoma | Zones 6b to 8a |
| Oregon | Zones 5b to 9b |
| Pennsylvania | Zones 5b to 8a |
| Rhode Island | Zones 6b to 7a |
| South Carolina | Zones 8a to 9b |
| South Dakota | Zones 4a to 5b |
| Tennessee | Zones 7a to 8a |
| Texas | Zones 6b to 10b |
| Utah | Zones 5a to 8b |
| Vermont | Zones 4a to 6a |
| Virginia | Zones 6a to 8b |
| Washington | Zones 6a to 9b |
| West Virginia | Zones 5b to 7a |
| Wisconsin | Zones 4a to 6a |
| Wyoming | Zones 4a to 5b |
Hardiness zone temperature ranges
Each zone is a 10°F band of average annual extreme minimum temperature, split into “a” (colder) and “b” (warmer) half zones of 5°F.
| Zone | Average annual extreme minimum |
|---|---|
| Zone 1a | −60 to −55°F |
| Zone 1b | −55 to −50°F |
| Zone 2a | −50 to −45°F |
| Zone 2b | −45 to −40°F |
| Zone 3a | −40 to −35°F |
| Zone 3b | −35 to −30°F |
| Zone 4a | −30 to −25°F |
| Zone 4b | −25 to −20°F |
| Zone 5a | −20 to −15°F |
| Zone 5b | −15 to −10°F |
| Zone 6a | −10 to −5°F |
| Zone 6b | −5 to 0°F |
| Zone 7a | 0 to 5°F |
| Zone 7b | 5 to 10°F |
| Zone 8a | 10 to 15°F |
| Zone 8b | 15 to 20°F |
| Zone 9a | 20 to 25°F |
| Zone 9b | 25 to 30°F |
| Zone 10a | 30 to 35°F |
| Zone 10b | 35 to 40°F |
| Zone 11a | 40 to 45°F |
| Zone 11b | 45 to 50°F |
| Zone 12a | 50 to 55°F |
| Zone 12b | 55 to 60°F |
| Zone 13a | 60 to 65°F |
Frequently asked questions
What does my growing zone mean?
Your zone tells you how cold winters typically get, so you can choose perennials, shrubs and trees that survive the winter. A plant labeled “hardy to zone 6” should survive winters in zones 6 and warmer. Zones don’t tell you when to plant: use your frost dates for that.
Did growing zones change in 2023?
Yes. The 2023 USDA map uses 1991–2020 data, replacing the 2012 map. USDA reported that about half of the country shifted into a warmer half zone. Read more about hardiness zones.