The frost/freeze headline season began for Down East Maine on
May 15th. The program expands to central and parts of northern
Maine on the 25th. The program does not begin across northwest
Maine until June 5th.
Below are the thresholds that the National Weather Service Forecast
office in Caribou uses when issuing frost advisories and freeze
warnings. Also included is a map of the dates the program
usually begins each spring, and is based on the latest
1981-2010 climate normals.