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Frost-Free Dates

Sources: USDA, "Growing Vegetables in the
home," 1972, North Dakota State Univ. Extension Service. The National
Arbor Day Foundation allows visitors to search by zip code for their
 Hardiness Zone . 
  

The top of the graphic below shows the percentage of recent change in temperatures.  Planter
 lies in Zone 5, but our frost-free dates belie the table below. Desertification and glacial meltdown are just
a hearbeat away . . .
Zone      Temperature range (F)    Frost-Free Date
1         below -50           ?
2         -50 to -40         June 10
3         -40 to -30         May 30
4         -30 to -20         May 20
5         -20 to -10         May 10
6         -10 to 0           Apr 30
7         0 to 10            Apr 20
8         10 to 20           Apr 10
9         20 to 30            ?
10        30 to 40            ?  
            

zone_hardinesschange.jpg (53474 bytes)