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Last frost date calculation

Silver Spring, MD(Zone 6b)

Just for curiosity's sake, I have found two websites that there appears to be discrepacy in last frost date..wished I had written them down but if I input my zip code in, one website gives me April 30th and another May 7..I know that we usually don't have frost after the last week of April but the soil temperature is usually too cold to plant starter plants out until about mid May. Now this past year was an exception..it got hot in early April, then we had a lot of rain and then it turned hot and never let up, staying between 90-103 for weeks. Which website do you use to figure out your last possible frost date?

Mid-Cape, MA(Zone 7a)

Well, there's always the Dave's Garden Frost Date Calculator. It comes quite close to that the old-time gardeners around here go by:
http://davesgarden.com/guides/freeze-frost-dates/

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