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Frost dates and growing zones in Maryland

6 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Maryland fall in USDA zones 7a, 7b, 8a. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Baltimore	8a	Mar 24	Nov 21
Frederick	7b	Apr 22	Oct 20
Rockville	7b	Apr 10	Nov 1
Hagerstown	7a	Apr 7	Nov 4
Annapolis	8a	Apr 10	Oct 31
Laurel	7b	Apr 10	Nov 1