1 ) A hard frost is a frost where both the air and the ground freeze. Many plants that can withstand a light frost, where only the tips of the stems are affected, but most cannot withstand a hard frost
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2 ) In gardening terms, a "light freeze" or "light frost" refers to temperatures that fall just a few degrees below freezing for a few hours. Some hardy plants may not be damaged. A "hard frost" or "killing frost" comes when the temperature drops further, below 28 degrees, for a longer time
