Middlesex County, Massachusetts · Frost dates
Middlesex County frost dates.
First-frost, last-frost, and growing-season length for Middlesex County, Massachusetts. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-12
- 50%
- 05-02
- 80%
- 04-24
- 90%
- 04-22
First fall frost
- 10%
- 09-25
- 20%
- 09-28
- 50%
- 10-06
- 80%
- 10-16
- 90%
- 10-22
28°F — killing freeze
Last spring freeze
- 10%
- 05-05
- 20%
- 04-30
- 50%
- 04-21
- 80%
- 04-12
- 90%
- 04-08
First fall freeze
- 10%
- 10-02
- 20%
- 10-06
- 50%
- 10-18
- 80%
- 10-30
- 90%
- 11-03
Growing season length (days, 28°F threshold)
- Short year
- 150
- Median
- 180
- Long year
- 209
Source NOAA station
MAYNARD 2, MA US
4.4 mi · 30 yrs of record (1991–2020) · 205 ft elev.
Data from MAYNARD 2, MA US, 4.4 miles away with 30-year NOAA record (1991-2020).
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