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The USDA Plant Hardiness map indicates Average Annual Minimum Temperatures within 10 degree F zones.
Plant hardiness zones should be used only as a starting point in determining which plants can be grown in your area. Low temperatures are only one of many factors determining plant hardiness. Local arboretums, botanical gardens, nursery workers, landscapers and other experienced plant people in your area are the best sources of plant hardiness information.
The map below comes from the National Arboretum Website. Following links on this page will take you out of the Landscape Plants website. The copyright © statement refers to material from the USDA site only.
The 200 US National Arboretum "Web Version" of the 1990 USDA Plant Hardiness Zone Map
Check the color of the section in your area of the map with the color key
below.
Zones 2b through 6a represented here.
 
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
Note:
This publication is not copyrighted, and permission to reproduce all or
any part of it is not required.
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