I didn't get this into the article, but there is a meteroilogical difference between 'frost' and 'freeze'. A frost, or white frost, occurs under a clear sky, is generally the result of radiational cooling - the heat of the day escaping into the clear sky - and clam winds and is accompanied by hoar frost, the rime of frozen dew that edges leaves and blossoms. A freeze, or black freeze often occurs on cloudy,even windy nights, turns everything black and is basically the end of the growing season.