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When are average first and last frost in the U.S. and Canada?

These 2 charts are the average first and last frost in the U.S. & Canada... A frost is when the outside temperature is 32*F or below... Chances of a frost after the spring date and before the fall date are about 50%... Since it is an average, dates will vary from year to year...

Average First and Last Frost in the U.S.
USFrost0


Average First and Last Frost in Canada
CAFrost0
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logic
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