Subject: Periodic Post FAQ US Plant Hardiness-Zones Rev 01

From: [email-masked] (Richard & Marsha)
Date: 4 Apr 1995 02:43:52 GMT

FAQ: US PLANT HARDINESS-ZONE CHART:

Remember there are extremes in each of the zones 
described below.  In each Zone you can have
Dry-Normal-Wet moisture patterns, wind patterns,
and sun/shade patterns.  It is entirely possible 
for your garden to be in one zone and your neighbor's
garden in another. Likewise in severe weather years
your Zone may vary from the normal pattern.

        Approximate range of Average  
        Annual MINIMUM Temperatures.
       (Based on 10 deg.F increments)

           C=Centigrade/  F=Farenheit

     Zone  1 =  below -45C/      -50F
     Zone  2 = -45C/-40C    -50F/-40F
     Zone  3 = -40C/-34C    -40F/-30F
     Zone  4 = -34C/-29C    -30F/-20F
     Zone  5 = -29C/-23C    -20F/-10F
     Zone  6 = -23C/-18C    -10F/  0F
     Zone  7 = -18C/-12C     0 F/+10F 
     Zone  8 = -12C/- 7C    +10F/+20F
     Zone  9 = - 7C/- 1C    +20F/+30F
     Zone 10 = - 1C/+ 4C    +30F/+40F
     Zone 11 =  above+4C/        +40F

...............=======ooo=======.................

       REVISED HARDINESS-ZONE CHART
     Annual Average MINIMUM Terperature
      (Based on 5 deg.F increments)

     Zone  1  =  below -45.6/c    -50F
     Zone  2a = -42.8/-45.5c  -50/-45F
     Zone  2b = -42.7/-40.0c  -45/-40F
     Zone  3a = -40.0/-37.3c  -40/-35F                   
     Zone  3b = -37.2/-34.5c  -35/-30F
     Zone  4a = -34.4/-31.7c  -30/-25F                      
     Zone  4b = -31.6/-28.9c  -25/-20F
     Zone  5a = -28.8/-26.2c  -20/-15F
     Zone  5b = -26.1/-23.4c  -15/-10F
     Zone  6a = -23.3/-20.6c  -10/- 5F
     Zone  6b = -20.5/-17.8c  - 5/  0F
     Zone  7a = -17.7/-15.0c    0/+ 5F
     Zone  7b = -15.0/-12.3c  + 5/+10F
     Zone  8a = -12.2/- 9.5c  +10/+15F 
     Zone  8b = - 9.4/- 6.7c  +15/+20F 
     Zone  9a = - 6.6/- 3.9c  +20/+25F  
     Zone  9b = - 3.8/- 1.2c  +25/+30F 
     Zone 10a = - 1.1/+ 1.6c  +30/+35F 
     Zone 10b = + 1.7/+ 4.4c  +35/+40F  
     Zone 11  =   above+4.5c/     +40F

...............=======ooo=======.................                      

NOTE: The dates below are for the Northern Hemisphere

Zone  1 = Average dates Last Frost = 1  Jun / 30 Jun
          Average dates First Frost= 1  Jul / 31 Jul
          Note: vulnerable to frost 365 days per year.          
          
Zone  2 = Average dates Last Frost = 1  May / 31 May
          Average dates First Frost= 1  Aug / 31 Aug

Zone  3 = Average dates Last Frost = 1  May / 31 May
          Average dates First Frost= 1  Sep / 30 Sep
          
Zone  4 = Average dates Last Frost = 1  May / 30 May
          Average dates Frist Frost= 1  Sep / 30 Sep
          
Zone  5 = Average dates Last Frost = 30 Mar / 30 Apr
          Average dates First Frost= 30 Sep / 30 Oct

Zone  6 = Average dates Last Frost = 30 Mar / 30 Apr 
          Average dates First Frost= 30 Sep / 30 Oct 

Zone  7 = Average dates Last Frost = 30 Mar / 30 Apr 
          Average dates First Frost= 30 Sep / 30 Oct 
          
Zone  8 = Average dates Last Frost = 28 Feb / 30 Mar 
          Average dates First Frost= 30 Oct / 30 Nov 

Zone  9 = Average dates Last Frost = 30 Jan / 28 Feb 
          Average dates First Frost= 30 Nov / 30 Dec

Zone 10 = Average dates Last Frost = 30 Jan or before
          Average dates Last Frost = 30 Nov / 30 Dec

Zone 11 = Free of Frost throughout the year.

.............=======ooo=======..................

Frost:		Light Freeze. damage depends upon 
                length of frost duration.

Light Freeze: 	-2C/-0C <> 29F/32F - tender plants  
		killed with little destructive 
		effect on other vegetation.

Moderate Freeze:-8C/-2C <> 25F/28F - wide destruction 
		on most vegetation with heavy 
		damage to fruit blossoms and  
		tender semi-hardy plants.

Severe Freeze:	-9C <> 24F and colder, heavy damage 
  		to most plants.
...............=======ooo=======...................

Shade:	  Usually an area under a closed tree canopy 
          that receives no direct sun at all.

Partial   Usually an area under a lone or limited 
Shade:    number of trees receiving only a 1 to 5  
          hours of dappled sun during the day.

Partial   Usually refers to an area that receives  
Sun:      approximately 3 - 5 hours of full 
	  sun per day.

Full Sun: Refers to an area receiving 6 or more 
          hours of full sun per day.

...............========ooo========.................

          Comments/Suggestions are welcome
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