Frederick County, Maryland · Frost dates
Frederick County frost dates.
First-frost, last-frost, and growing-season length for Frederick County, Maryland. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-15
- 20%
- 04-11
- 50%
- 04-02
- 80%
- 03-23
- 90%
- 03-17
First fall frost
- 10%
- 10-23
- 20%
- 10-29
- 50%
- 11-06
- 80%
- 11-17
- 90%
- 11-24
28°F — killing freeze
Last spring freeze
- 10%
- 04-04
- 20%
- 03-31
- 50%
- 03-21
- 80%
- 03-10
- 90%
- 03-03
First fall freeze
- 10%
- 11-06
- 20%
- 11-10
- 50%
- 11-21
- 80%
- 12-05
- 90%
- 12-11
Growing season length (days, 28°F threshold)
- Short year
- 216
- Median
- 245
- Long year
- 283
Source NOAA station
FREDERICK POLICE BRKS, MD US
4.3 mi · 30 yrs of record (1991–2020) · 380 ft elev.
Data from FREDERICK POLICE BRKS, MD US, 4.3 miles away with 30-year NOAA record (1991-2020).
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