Frost – Predicting Last
What do the records show about the last frost in the spring? Using 32 degrees as the reference point, the most likely date for a last frost is March 27. The earliest date for a last spring frost was February 16 and the latest frost in spring occurred on April 23. In 1983 the last frost was April 20. (Imagine what those freezes did to spring landscapes!)
If we choose 16 degrees as the mark of severe cold weather, record keepers say there is a 90% chance of its occurrence before December 25 each year.
In spring, the average date it occurs is February 5 and the latest date that 16 degrees occurred in thirty years was March 4.
See also Predicting First Frost