Map Color Zone Fahrenheit
  1 Below -50 F
  2a -50 to -45 F
  2b -45 to -40 F
  3a -40 to -35 F
  3b -35 to -30 F
  4a -30 to -25 F
  4b -25 to -20 F
  5a -20 to -15 F
  5b -15 to -10 F
  6a -10 to -5 F
  6b -5 to 0 F
  7a 0 to 5 F
  7b 5 to 10 F
  8a 10 to 15 F
  8b 15 to 20 F
  9a 20 to 25 F
  9b 25 to 30 F
  10a 30 to 35 F
  10b 35 to 40 F
  11 above 40 F
     
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USDA Zone Map