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 The USDA Plant Hardiness Zone Map from USDA Miscellaneous Publication No. 1475, Issued January 1990.

U.S. Hardiness Zones and 20-inch Rainfall Lines
USDA Zone Temperature Range Example Cities When to Plant Outside
1
Below -50 F
(below -45.6C)
Fairbanks, Alaska
Resolute, Northwest Territories (Canada)
N/A
2
-50 to -45 F
(-42.8 to -45.5 C)
Prudhoe Bay, Alaska
Flin Flon, Manitoba (Canada)
Outside Mid-June
3
-40 to -35 F
(-37.3 to -39.9 C)
International Falls, Minnesota
St. Michael, Alaska, Tomahawk, Wisconsin, Sidney, Montana
Outside Mid-Late May
4
-25 to -20 F
(-28.9 to -31.6 C)
Minneapolis/St.Paul, Minnesota; Northwood, Iowa
Nebraska
Outside May 1
5
-20 to -15 F
(-26.2 to -28.8 C)
Des Moines, Iowa; Columbus, Ohio; Indianapolis, Indiana
Illinois
Outside April 15
6
-10 to -5 F
(-20.6 to -23.3 C)
St. Louis, Missouri; Lebanon, Pennsylvania; Newark, New Jersey Outside April 1
7
0 to 5 F
(-15.0 to -17.7 C)
Oklahoma City, Oklahoma
South Boston, Virginia
Outside March 15
8
10 to 15 F
(-9.5 to -12.2 C)
Tifton, Georgia
Dallas, Texas
Outside March 15
9
20 to 25 F
(-3.9 to -6.6 C)
Houston, Texas
St. Augustine, Florida
Outside March 1
10
30 to 35 F
(1.6 to -1.1 C)
Naples, Florida
Barstow, California
Outside Feb 15
11
above 40 F
(above 4.5 C)
Honolulu, Hawaii
Mazatlan, Mexico
Outside Anytime