Freeze warning

A freeze warning issued in America is a warning issued by the National Weather Service when the temperature is going to be projected as below 32 °F (0 °C) for a long period of time. This is used if the temperature is low enough to cause the most impact at that time of year.

The warning is used in the fall to mark the end of the growing season with the first episode of a widespread freeze. This is due to the temperature threshold that kills certain types of commercial crops and residential plants. However, if the temperature drops below 28 °F (−2 °C) for a length of time it can kill most types of commercial crops and residential plants.The end of growing season occurs in mid to late October west of the Blue Ridge mountains and early November east of the mountains, but if the climate is warm the growing season may extend longer. Historically, these dates started earlier in September.

At the end of spring, another freeze warning is issued at the start of growing season if it is predicted to cause damage to new plants and crops.

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