Montgomery County, Maryland · Frost dates
Montgomery County frost dates.
First-frost, last-frost, and growing-season length for Montgomery 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%
- 04-10
- 50%
- 04-01
- 80%
- 03-24
- 90%
- 03-19
First fall frost
- 10%
- 10-24
- 20%
- 10-29
- 50%
- 11-06
- 80%
- 11-15
- 90%
- 11-21
28°F — killing freeze
Last spring freeze
- 10%
- 04-04
- 20%
- 03-31
- 50%
- 03-22
- 80%
- 03-11
- 90%
- 03-05
First fall freeze
- 10%
- 11-05
- 20%
- 11-09
- 50%
- 11-19
- 80%
- 12-01
- 90%
- 12-06
Growing season length (days, 28°F threshold)
- Short year
- 215
- Median
- 242
- Long year
- 276
Source NOAA station
ROCKVILLE 1 NE, MD US
3.9 mi · 30 yrs of record (1991–2020) · 440 ft elev.
Data from ROCKVILLE 1 NE, MD US, 3.9 miles away with 30-year NOAA record (1991-2020).
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