Grafton County, New Hampshire · Frost dates
Grafton County frost dates.
First-frost, last-frost, and growing-season length for Grafton County, New Hampshire. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-25
- 20%
- 05-21
- 50%
- 05-12
- 80%
- 05-03
- 90%
- 04-30
First fall frost
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-06
- 80%
- 10-16
- 90%
- 10-22
28°F — killing freeze
Last spring freeze
- 10%
- 05-12
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-22
- 90%
- 04-18
First fall freeze
- 10%
- 10-05
- 20%
- 10-09
- 50%
- 10-20
- 80%
- 10-31
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 146
- Median
- 173
- Long year
- 200
Source NOAA station
WENTWORTH, NH US
5.5 mi · 30 yrs of record (1991–2020) · 653 ft elev.
Data from WENTWORTH, NH US, 5.5 miles away with 30-year NOAA record (1991-2020).
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