Merrimack County, New Hampshire · Frost dates
Merrimack County frost dates.
First-frost, last-frost, and growing-season length for Merrimack County, New Hampshire. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-28
- 20%
- 05-23
- 50%
- 05-14
- 80%
- 05-04
- 90%
- 04-30
First fall frost
- 10%
- 09-14
- 20%
- 09-21
- 50%
- 09-29
- 80%
- 10-07
- 90%
- 10-13
28°F — killing freeze
Last spring freeze
- 10%
- 05-16
- 20%
- 05-10
- 50%
- 04-30
- 80%
- 04-23
- 90%
- 04-18
First fall freeze
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-09
- 80%
- 10-25
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 133
- Median
- 162
- Long year
- 197
Source NOAA station
SALISBURY, NH US
4.7 mi · 30 yrs of record (1991–2020) · 550 ft elev.
Data from SALISBURY, NH US, 4.7 miles away with 30-year NOAA record (1991-2020).
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