Frost dates in St. Mary's County, Maryland

Marsh islands in Sinepuxent Bay near Assateague Island, Maryland — Photo: Acroterion, CC BY-SA 4.0, via Wikimedia Commons

The average last spring frost in St. Mary's County falls Mar 22 to Apr 17 and the average first fall frost Oct 27 to Nov 26, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 7b to 8a. Places: California, Callaway, Leonardtown, Lexington Park, Mechanicsville, Piney Point. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.

ZIP	Place	Last spring frost	First fall frost	Zone
20606		Apr 17	Oct 27	8a
20609		Apr 17	Oct 27	8a
20618		Apr 17	Oct 27	8a
20619	California	Mar 22	Nov 26	7b
20620	Callaway	Mar 22	Nov 26	8a
20621		Apr 17	Oct 27	7b
20624		Apr 17	Oct 27	7b
20626		Apr 8	Oct 30	8a
20628		Mar 30	Nov 14	8a
20630		Mar 30	Nov 14	8a
20634	California	Mar 22	Nov 26	8a
20636		Mar 22	Nov 26	7b
20650	Leonardtown	Mar 22	Nov 26	7b
20653	Lexington Park	Mar 29	Nov 15	8a
20656		Apr 17	Oct 27	7b
20659	Mechanicsville	Apr 17	Oct 27	7b
20660		Apr 17	Oct 27	7b
20667		Mar 30	Nov 14	8a
20670		Mar 29	Nov 15	8a
20674	Piney Point	Mar 30	Nov 14	8a
20680		Mar 30	Nov 14	8a
20684		Mar 30	Nov 14	8a
20686		Mar 30	Nov 14	8a
20687		Mar 30	Nov 14	8a
20690	Tall Timbers	Mar 30	Nov 14	8a
20692		Mar 30	Nov 14	8a

Nearby counties

Calvert County Charles County Dorchester County Somerset County Talbot County Prince George's County

All Maryland counties · Download Maryland frost dates (CSV)

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