|
|
|
North-Midwest
US
Iowa,
Minnesota, Montana, Nebraska, North Dakota,
South Dakota,
Wisconsin, Wyoming
|
|
 |
 |
USDA
Hardiness Zones and Average Annual Minimum Temperature Range
|
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 |
-23.4 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; Victorville, 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 |
USDA
Miscellaneous Publication No. 1475. Issued January 1990.
Authored by Henry
M. Cathey while Director, U.S. National Arboretum
Edited, formatted
and prepared for the US National Arboretum web site by Ramon Jordan, March 1998
& Revised March 2001
U.S. National
Arboretum, Agricultural Research Service, U.S. Department of Agriculture,
Washington, DC 20002
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