Suffolk County, Massachusetts · Frost dates
Suffolk County frost dates.
First-frost, last-frost, and growing-season length for Suffolk County, Massachusetts. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-17
- 20%
- 04-11
- 50%
- 04-04
- 80%
- 03-30
- 90%
- 03-25
First fall frost
- 10%
- 10-29
- 20%
- 11-01
- 50%
- 11-09
- 80%
- 11-17
- 90%
- 11-22
28°F — killing freeze
Last spring freeze
- 10%
- 04-06
- 20%
- 04-03
- 50%
- 03-28
- 80%
- 03-19
- 90%
- 03-15
First fall freeze
- 10%
- 11-08
- 20%
- 11-12
- 50%
- 11-21
- 80%
- 12-01
- 90%
- 12-05
Growing season length (days, 28°F threshold)
- Short year
- 216
- Median
- 238
- Long year
- 265
Source NOAA station
BOSTON LOGAN INTL AP, MA US
1.6 mi · 30 yrs of record (1991–2020) · 12 ft elev.
Data from BOSTON LOGAN INTL AP, MA US, 1.6 miles away with 30-year NOAA record (1991-2020).
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