Frost Dates in Maryland

At the middle station of the 36 in Maryland where a freeze comes every year, the last spring frost (50%) is April 9 and the first fall frost November 2, a freeze-free season of 207 days. The last frost is earliest at Lusby (Solomons, MD, March 22) and latest at Oakland (Oakland 1 SE, MD, May 6), 45 days apart. The season runs from 156 days at Oakland to 248 at Lusby.

28 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 3 days later; the season lengthened at 26 stations and shortened at 2. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.