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USDA Hardiness Zones and Average Annual Minimum Temperature Range
| USDA Zone | Temperature Range | Example Cities |
|---|---|---|
| 1 | Below -50 F (below -45.6C) | Fairbanks,
Alaska Resolute, Northwest Territories (Canada) |
| 2a | -50 to -45 F (-42.8 to -45.5 C) | Prudhoe
Bay, Alaska Flin Flon, Manitoba (Canada) |
| 2b | -45 to -40 F (-40.0 to -42.7 C) | Unalakleet,
Alaska Pinecreek, Minnesota |
| 3a | -40 to -35 F (-37.3 to -39.9 C) | International
Falls, Minnesota St. Michael, Alaska |
| 3b | -35 to -30 F (-34.5 to -37.2 C) | Tomahawk,
Wisconsin Sidney, Montana |
| 4a | -30 to -25 F (-31.7 to -34.4 C) | Minneapolis/St.Paul,
Minnesota Lewistown, Montana |
| 4b | -25 to -20 F (-28.9 to -31.6 C) | Northwood,
Iowa Nebraska |
| 5a | -20 to -15 F (-26.2 to -28.8 C) | Des
Moines, Iowa Illinois |
| 5b | -15 to -10 F (-23.4 to -26.1 C) | Columbia,
Missouri Mansfield, Pennsylvania |
| 6a | -10 to -5 F (-20.6 to -23.3 C) | St.
Louis, Missouri Lebanon, Pennsylvania |
| 6b | -5 to 0 F (-17.8 to -20.5 C) | McMinnville,
Tennessee Branson, Missouri |
| 7a | 0 to 5 F (-15.0 to -17.7 C) | Oklahoma
City, Oklahoma South Boston, Virginia |
| 7b | 5 to 10 F (-12.3 to -14.9 C) | Little
Rock, Arkansas Griffin, Georgia |
| 8a | 10 to 15 F (-9.5 to -12.2 C) | Tifton,
Georgia Dallas, Texas |
| 8b | 15 to 20 F (-6.7 to -9.4 C) | Austin,
Texas Gainesville, Florida |
| 9a | 20 to 25 F (-3.9 to -6.6 C) | Houston,
Texas St. Augustine, Florida |
| 9b | 25 to 30 F (-1.2 to -3.8 C) | Brownsville,
Texas Fort Pierce, Florida |
| 10a | 30 to 35 F (1.6 to -1.1 C) | Naples,
Florida Barstow, California |
| 10b | 35 to 40 F (4.4 to 1.7 C) | Miami,
Florida Coral Gables, Florida |
| 11 | above 40 F (above 4.5 C) | Honolulu,
Hawaii Mazatlan, Mexico |