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  • From: "Sandie Parrott" <rsbirdy@comcast.net>
  • To: "gardenwriters-on-gardening" <gwl-g@lists.ibiblio.org>
  • Subject: Re: [gwl-g] Last Frost Date
  • Date: Thu, 27 Apr 2006 11:31:25 -0400

For a list of US State and City frost dates go to...
 
 
Sandie Parrott
Freelance Garden and Travel, Writer and Photographer
Contributor to...
Michigan Gardener Magazine
Natural Awakenings Magazine
FREE OC - The Ultimate Free Fun Guide to the California Riviera
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Phone: 248-394-1532
Email: RSBirdy@Comcast.net
Website: www.SandieParrott.com
----- Original Message -----
From: N Sterman
Sent: Thursday, April 27, 2006 11:17 AM
Subject: Re: [gwl-g] Last Frost Date

Hi Ellen,

Frost dates are calculated as 30 year averages.  Here in San Diego, they are published in  a compilation book entitled Climates of San Diego County: Agricultural Relationships.  That book contains topographical-style maps that indicate first and last frost dates for the county.  First frost maps are separated from last frost as not every area has the same first/last frost dates.

That book is a publication of the University of California Agricultural Extension Service; AND the Environmental Science Services Administration; AND the United States Weather Bureau.

So all three agencies were involved.  Our most recent edition was published in 1970 so, as many others pointed out, frost dates are extremely outdated.  That said, San Diego (and all of California) has such varied topography that we have tremendous variations over very small areas (like within a single suburban block) which translates to a kazillion microclimates.  

Bottom line is, when talking about frost dates, they are merely rules of thumb.  

Nan


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