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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

-40 to -35 F  (-37.3 to -39.9 C)

International Falls, Minnesota
St. Michael, Alaska

-35 to -30 F  (-34.5 to -37.2 C)

Tomahawk, Wisconsin
Sidney, Montana

-30 to -25 F  (-31.7 to -34.4 C)

Minneapolis/St. Paul, Minnesota
Lewistown, Montana

-25 to -20 F  (-28.9 to -31.6 C)

Northwood, Iowa

-20 to -15 F  (-26.2 to -28.8 C)

Des Moines, Iowa

-15 to -10 F  (-23.4 to -26.1 C)

Columbia, Missouri
Mansfield, Pennsylvania

-10 to -5 F  (-20.6 to -23.3 C)

St. Louis, Missouri
Lebanon, Pennsylvania

-5 to 0 F  (-17.8 to -20.5 C)

McMinnville, Tennessee
Branson, Missouri

0 to 5 F  (-15.0 to -17.7 C)

Oklahoma City, Oklahoma
South Boston, Virginia

5 to 10 F  (-12.3 to -14.9 C)

Little Rock, Arkansas
Griffin, Georgia

10 to 15 F  (-9.5 to -12.2 C)

Tifton, Georgia
Dallas, Texas 

15 to 20 F  (-6.7 to -9.4 C)

Austin, Texas 
Gainesville, Florida

20 to 25 F  (-3.9 to -6.6 C)

Houston, Texas 
St. Augustine, Florida

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 October 20, 2018