From lionhert@ix.netcom.com Mon May 22 13:28:44 EDT 1995 Article: 71017 of rec.gardens Path: bigblue.oit.unc.edu!concert!news-server.ncren.net!taco.cc.ncsu.edu!gatech!howland.reston.ans.net!ix.netcom.com!netnews From: lionhert@ix.netcom.com (Richard & Marsha) Newsgroups: rec.gardens Subject: Periodic Post FAQ US Plant Hardiness-Zones Date: 20 May 1995 02:16:44 GMT Organization: Netcom Lines: 136 Distribution: world Message-ID: <3pjjec$6va@ixnews4.ix.netcom.com> NNTP-Posting-Host: ix-sc3-04.ix.netcom.com 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 neighbors 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=======..................... AVERAGE DATES OF FIRST AND LAST FROST NOTE: The dates below are for the Northern Hemisphere (Adjust appropriately for Southern 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 First Frost= 30 Nov / 30 Dec Zone 11 = Free of Frost throughout the year. .................=======ooo=======..................... STANDARD DEFINITIONS 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 lionhert@ix.netcom.com The Internet = CyberKudzu