Frost Dates in Vermont

At the middle station of the 38 in Vermont where a freeze comes every year, the last spring frost (50%) is May 13 and the first fall frost October 2, a freeze-free season of 143 days. The last frost is earliest at Milton (S Hero, VT, April 28) and latest at Plainfield (Plainfield, VT, May 25), 27 days apart. The season runs from 119 days at Plainfield to 174 at Milton.

25 of these stations were also in NOAA's previous normals, for 1981–2010. Between the two, the median station's freeze-free season grew 6 days longer, with the last spring frost 2 days earlier and the first fall frost 2 days later; the season lengthened at 20 stations and shortened at 2. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.