Frost history / Franklin Falls Dam, NH
Franklin Falls Dam, NH: frost dates by year
Last spring and first fall frost at NOAA station USC00273182, 1951 to 2025, measured from daily minimum temperatures.
Elevation 450 ft, 43.470, -71.654. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 19 | Sep 23 |
| Earliest | Apr 22 (2025) | Aug 22 (1982) |
| Latest | Jun 12 (1972) | Oct 24 (2023) |
| Trend | 2.9 days earlier per decade | 2.2 days later per decade |
| Years with data | 36 | 38 |
At 28°F (hard freeze) the median last spring date is May 6 and the median first fall date is Oct 7.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Apr 22 | Sep 21 | Apr 21 | Oct 10 |
| 2024 | Apr 27 | Oct 17 | Apr 27 | Oct 17 |
| 2023 | May 19 | Oct 24 | May 18 | Oct 31 |
| 2022 | May 11 | Sep 30 | Apr 22 | Oct 20 |
| 2021 | no data | Oct 24 | no data | Nov 3 |
| 2020 | no data | Sep 20 | no data | Sep 20 |
| 2019 | May 10 | Oct 5 | Apr 18 | Oct 7 |
| 2018 | May 14 | Oct 15 | Apr 24 | Oct 19 |
| 2017 | May 10 | Oct 2 | Apr 14 | Oct 17 |
| 2014 | no data | Sep 19 | no data | Nov 4 |
| 2013 | May 26 | Sep 17 | May 16 | Oct 29 |
| 1990 | May 25 | no data | Apr 15 | no data |
| 1989 | May 9 | Sep 25 | Apr 29 | Oct 5 |
| 1988 | May 9 | Sep 16 | Apr 26 | Oct 7 |
| 1987 | May 20 | Sep 26 | May 2 | Oct 13 |
| 1986 | May 14 | Sep 15 | May 5 | Oct 8 |
| 1985 | May 30 | Oct 7 | May 9 | Oct 17 |
| 1984 | May 19 | Sep 6 | May 18 | Oct 6 |
| 1983 | May 19 | Sep 15 | May 19 | Oct 11 |
| 1982 | May 6 | Aug 22 | Apr 30 | Oct 11 |
| 1981 | May 20 | Oct 6 | May 19 | Oct 10 |
| 1980 | Jun 11 | Sep 25 | Apr 22 | Oct 10 |
| 1979 | May 8 | Sep 20 | May 7 | Sep 20 |
| 1978 | May 12 | Sep 10 | May 6 | Sep 27 |
| 1977 | May 16 | Sep 12 | May 15 | Oct 7 |
| 1976 | May 13 | Aug 31 | May 9 | Sep 25 |
| 1975 | Jun 10 | Sep 15 | Apr 30 | Oct 5 |
| 1974 | May 21 | Sep 24 | May 8 | Sep 24 |
| 1973 | Jun 3 | Sep 21 | Apr 20 | Sep 21 |
| 1972 | Jun 12 | Sep 23 | May 12 | Oct 3 |
| 1971 | no data | Sep 25 | no data | Sep 25 |
| 1959 | May 18 | no data | May 18 | no data |
| 1958 | Jun 7 | Sep 12 | May 3 | Oct 2 |
| 1957 | May 19 | Sep 25 | May 19 | Sep 29 |
| 1956 | May 29 | Sep 19 | May 26 | Sep 21 |
| 1955 | May 20 | Sep 13 | May 18 | Sep 23 |
| 1954 | May 27 | Oct 7 | Apr 29 | Oct 8 |
| 1953 | Jun 1 | Sep 23 | Apr 22 | Sep 24 |
| 1952 | May 17 | Sep 28 | May 6 | Oct 9 |
| 1951 | Jun 8 | Sep 27 | May 19 | Sep 30 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.