US National Arboretum

 
 

US National Arboretum

North-Midwest US

Iowa, Minnesota, Montana, Nebraska, North Dakota,
South Dakota, Wisconsin, 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 2b through 6a represented here.
   

North-Midwest region Hardiness Zone MapZones Color Key

USDA Hardiness Zones and Average Annual Minimum Temperature Range

  Zone  
  Fahrenheit  
    Celsius    
  Example Cities  
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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Last Updated   October 6, 2003 4:14 PM
URL = http://www.usna.usda.gov/Hardzone/hzm-nm1.html

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