USDA Plant Hardiness Zone Map

South-Midwest US

Arkansas, Colorado, Illinois, Kansas, Louisiana,
Mississippi, Missouri, New Mexico, Oklahoma, Texas

Zones 4b through 9b represented here.
   

South-Midwest region Hardiness Zone Map Zone 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