Bield:Farm
Frost dates · Maryland

Maryland frost dates,
county by county.

Last spring frost and first fall frost probability data for all 24 counties in Maryland, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.

Variation across Maryland

45 days separate the earliest and latest counties.

The median last spring frost in Baltimore city is March 11 — 45 days earlier than Garrett County at April 25. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.

By geography

Maryland counties on the map.

Each dot is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.

ListMap
Washington County · Spring Mar 31 · Fall Nov 9 · 223-day seasonAllegany County · Spring Apr 3 · Fall Nov 3 · 214-day seasonCaroline County · Spring Mar 30 · Fall Nov 11 · 226-day seasonWicomico County · Spring Mar 21 · Fall Nov 21 · 245-day seasonSt. Mary's County · Spring Mar 19 · Fall Nov 29 · 255-day seasonCarroll County · Spring Apr 9 · Fall Oct 31 · 205-day seasonDorchester County · Spring Mar 27 · Fall Nov 17 · 235-day seasonGarrett County · Spring Apr 25 · Fall Oct 24 · 182-day seasonKent County · Spring Mar 21 · Fall Nov 17 · 241-day seasonMontgomery County · Spring Mar 22 · Fall Nov 19 · 242-day seasonTalbot County · Spring Mar 20 · Fall Nov 20 · 245-day seasonBaltimore city · Spring Mar 11 · Fall Dec 5 · 269-day seasonCecil County · Spring Mar 27 · Fall Nov 13 · 231-day seasonHoward County · Spring Mar 25 · Fall Nov 21 · 241-day seasonCalvert County · Spring Apr 2 · Fall Nov 6 · 218-day seasonQueen Anne's County · Spring Mar 21 · Fall Nov 17 · 241-day seasonCharles County · Spring Mar 17 · Fall Nov 22 · 250-day seasonSomerset County · Spring Mar 20 · Fall Nov 24 · 249-day seasonWorcester County · Spring Mar 29 · Fall Nov 11 · 227-day seasonAnne Arundel County · Spring Mar 14 · Fall Nov 28 · 259-day seasonHarford County · Spring Mar 29 · Fall Nov 10 · 226-day seasonBaltimore County · Spring Mar 22 · Fall Nov 20 · 243-day seasonFrederick County · Spring Mar 21 · Fall Nov 21 · 245-day seasonPrince George's County · Spring Mar 30 · Fall Nov 10 · 225-day season
Last spring frostEarliestMedianLatest
24 counties · click any county for full frost data
Alphabetical

All Maryland counties — A to Z.

Frost dates set the calendar. Bield: Farm runs it.

Pair these dates with live forecasts for your specific farm location. Bield: Farm logs your soil tests, planting dates, weather, and yield outcomes year over year.

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