USNA – USDA Plant Hardiness Zone Map: Northwest USA
Includes: Oregon, Idaho, Montana, Washington, Wyoming
The 2003 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 1 through 7b represented here.
North-West USA Hardiness Zones
Hardiness Zones Key
USDA Hardiness Zones and Average Annual Minimum Temperature Range |
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Fairbanks, Alaska; Resolute, Northwest Territories (Canada) |
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Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada) |
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Unalakleet, Alaska; Pinecreek, Minnesota |
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International Falls, Minnesota; St. Michael, Alaska |
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Tomahawk, Wisconsin; Sidney, Montana |
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Minneapolis/St.Paul, Minnesota; Lewistown, Montana |
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Northwood, Iowa; Nebraska |
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Des Moines, Iowa; Illinois |
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Columbia, Missouri; Mansfield, Pennsylvania |
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St. Louis, Missouri; Lebanon, Pennsylvania |
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McMinnville, Tennessee; Branson, Missouri |
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Oklahoma City, Oklahoma; South Boston, Virginia |
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Little Rock, Arkansas; Griffin, Georgia |
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Tifton, Georgia; Dallas, Texas |
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Austin, Texas; Gainesville, Florida |
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Houston, Texas; St. Augustine, Florida |
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Brownsville, Texas; Fort Pierce, Florida |
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Naples, Florida; Victorville, California |
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Miami,Florida; Coral Gables, Florida |
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Honolulu, Hawaii; Mazatlan, Mexico |
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