For those in different growing zones, the difference between a frost and a freeze is probably rather cryptic but it is very important. A freeze is mostly what you would expect - the temperature declines below 32 F, often with winds, overcast or even precipitation. The higher the winds, the more severe the damage. A frost, on the other hand, can occur as high as 40F and requires clear night skies, very still air, and a flat terrain or a valley. Even in these conditions, plants under a tree or other screen from the open sky will be protected from frost. Frost damage is caused by radiant heat loss to outer space creating a micro-clime or surface pool of cold air. This micro-clime can be 10F colder than the measured air temperature. Sloping land, cloud (or other) cover, or wind will destroy the effect as will a nearby building. Frosts cannot occur in forests because any heat loss from the upper leaves is replaced as the cool air drops and is replaced by warmer air. Tim