Hillsborough County, New Hampshire · Frost dates
Hillsborough County frost dates.
First-frost, last-frost, and growing-season length for Hillsborough County, New Hampshire. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-15
- 20%
- 05-10
- 50%
- 05-03
- 80%
- 04-26
- 90%
- 04-22
First fall frost
- 10%
- 09-25
- 20%
- 09-29
- 50%
- 10-05
- 80%
- 10-13
- 90%
- 10-18
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-28
- 50%
- 04-20
- 80%
- 04-11
- 90%
- 04-07
First fall freeze
- 10%
- 10-03
- 20%
- 10-07
- 50%
- 10-16
- 80%
- 10-27
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 154
- Median
- 179
- Long year
- 208
Source NOAA station
MILFORD, NH US
6.2 mi · 30 yrs of record (1991–2020) · 320 ft elev.
Data from MILFORD, NH US, 6.2 miles away with 30-year NOAA record (1991-2020).
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