Maryland frost dates by county and ZIP code
Across 477 Maryland ZIP codes the average last spring frost runs Mar 22 to May 9 and the average first fall frost Oct 9 to Nov 26 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.
Counties
- Allegany
- Anne Arundel
- Baltimore
- Baltimore city
- Calvert
- Caroline
- Carroll
- Cecil
- Charles
- Dorchester
- Frederick
- Garrett
- Harford
- Howard
- Kent
- Montgomery
- Prince George's
- Queen Anne's
- Somerset
- St. Mary's
- Talbot
- Washington
- Wicomico
- Worcester
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