Q: What is the difference between a frost and a hard freeze?
A: A frost refers to the conditions that allow a layer of ice crystals to form when water vapor condenses and freezes without first becoming dew. A hard freeze is a period of at least four consecutive hours of air temperatures that are below 25 degrees F. Many plants can survive a brief frost, but very few can survive a hard freeze.
Courtesy of The Old Farmer's Almanac
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