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 polygon is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.
MapList
Last spring frostEarliestMedianLatest
24 counties · click any county for full frost data