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USDA plant hardiness zone chart
All 26 zones on the 2023 USDA map with the average coldest winter night, ZIP code counts and example places.
What is on this chart
Each zone is the average coldest winter night of the year. Pick plants rated for your zone or colder.
| Zone | Average coldest night | ZIP codes | For example |
|---|---|---|---|
| 1a | -60 to -55°F (-51 to -48°C) | 5 | Alaska |
| 1b | -55 to -50°F (-48 to -46°C) | 11 | Alaska |
| 2a | -50 to -45°F (-46 to -43°C) | 27 | Alaska |
| 2b | -45 to -40°F (-43 to -40°C) | 17 | Alaska |
| 3a | -40 to -35°F (-40 to -37°C) | 23 | Alaska, Minnesota |
| 3b | -35 to -30°F (-37 to -34°C) | 230 | Fairbanks, AK |
| 4a | -30 to -25°F (-34 to -32°C) | 814 | Fargo, ND, Bismarck, ND |
| 4b | -25 to -20°F (-32 to -29°C) | 1,284 | Duluth, MN, Saint Cloud, MN |
| 5a | -20 to -15°F (-29 to -26°C) | 2,426 | Minneapolis, MN, Saint Paul, MN |
| 5b | -15 to -10°F (-26 to -23°C) | 2,880 | Des Moines, IA, Madison, WI |
| 6a | -10 to -5°F (-23 to -21°C) | 5,187 | Chicago, IL, Denver, CO |
| 6b | -5 to 0°F (-21 to -18°C) | 5,271 | Pittsburgh, PA, Kansas City, MO |
| 7a | 0 to 5°F (-18 to -15°C) | 4,877 | Saint Louis, MO, Louisville, KY |
| 7b | 5 to 10°F (-15 to -12°C) | 3,855 | New York, NY, Philadelphia, PA |
| 8a | 10 to 15°F (-12 to -9°C) | 3,430 | Washington, DC, Atlanta, GA |
| 8b | 15 to 20°F (-9 to -7°C) | 3,379 | El Paso, TX, Dallas, TX |
| 9a | 20 to 25°F (-7 to -4°C) | 2,199 | San Antonio, TX, Austin, TX |
| 9b | 25 to 30°F (-4 to -1°C) | 2,085 | Houston, TX, Sacramento, CA |
| 10a | 30 to 35°F (-1 to 2°C) | 1,234 | Phoenix, AZ, Orlando, FL |
| 10b | 35 to 40°F (2 to 4°C) | 752 | Los Angeles, CA, San Diego, CA |
| 11a | 40 to 45°F (4 to 7°C) | 205 | Miami, FL, Fort Lauderdale, FL |
| 11b | 45 to 50°F (7 to 10°C) | 16 | Florida, Hawaii |
| 12a | 50 to 55°F (10 to 13°C) | 30 | Hawaii |
| 12b | 55 to 60°F (13 to 16°C) | 137 | Honolulu, HI |
| 13a | 60 to 65°F (16 to 18°C) | 102 | Hawaii |
| 13b | 65 to 70°F (18 to 21°C) | 26 |
Find your zone by ZIP code at plantsdirectusa.com. Sources: 2023 USDA Plant Hardiness Zone Map (USDA ARS) and PRISM Climate Group ZIP code listings.
