| USDA Hardiness Zones and Average Annual Minimum Temperature Range |
| Zone |
Fahrenheit |
Celsius |
Example Cities |
| 1 |
Below -50 F |
Below -45.6 C |
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 |
-23.4to -26.1 C |
Columbia, Missouri; Mansfield, Pennsylvania |
| 6a |
-10 to -5 F |
-20.6 to -23.3 C |
St. Louis, Missouri; Lebanon, Pennsylvania |
| 6b |
-5to 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 |
-9.5to -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; Victorville, California |
| 10b |
35 to 40 F |
4.4 to 1.7 C |
Miami, Florida; Coral Gables, Florida |
| 11 |
above 40 F |
above4.5 C |
Honolulu, Hawaii; Mazatlan, Mexico |
*Note: Zones 2-10 in the map have been subdivided into light- and dark-colored sections (a and b) that represent 5 F (2.8 C) differences within the 10 F (5.6 C) zone. The light color of each zone represents the colder section; the dark color, the warmer section. Zone 11 represents any area where the average annual minimum temperature is above 40 F (4.4 C).
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