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USDA Plant Hardiness Zone Map
Northwest US:  Oregon, Idaho, Montana, Washington, Wyoming

[Back to the Zone Map Page] [Back to Main Page]


Check the color of the section in your area of the map with the color key below.   Zones 3a through 9b represented here.

  north-west area


USDA Hardiness Zones and Average Annual Minimum
Temperature Range


 USDA Zone Temperature Range Example Cities
        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 
        8

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
        9

25 to 30 F  (-1.2 to -3.8 C)

Brownsville, Texas 
Fort Pierce, Florida

Listed by zone: Names of representative plants listed under the coldest zones in which they normally succeed.
Listed alphabetically: Cold hardiness ratings (zones) for selected woody plants.


Data based on USDA Miscellaneous Publication No. 1475.  Issued January 1990, U.S. National Arboretum, Agricultural Research Service, U.S. Department of Agriculture, Washington, DC 20002.


 

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Updated on January 01, 2017