Frost history / Nashua Cwsu, NH
Nashua Cwsu, NH: frost dates by year
Last spring and first fall frost at NOAA station USC00275703, 2015 to 2025, measured from daily minimum temperatures.
Elevation 180 ft, 42.735, -71.480. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 28 | Oct 13 |
| Earliest | Apr 21 (2025) | Sep 20 (2020) |
| Latest | May 18 (2023) | Oct 24 (2023) |
| Trend | 2.9 days later per decade | little change (less than half a day per decade) |
| Years with data | 11 | 11 |
At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 19.
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 21 | Oct 10 | Apr 18 | Oct 10 |
| 2024 | Apr 27 | Oct 13 | Apr 27 | Oct 17 |
| 2023 | May 18 | Oct 24 | May 18 | Oct 31 |
| 2022 | May 9 | Oct 9 | Apr 21 | Oct 21 |
| 2021 | Apr 23 | Oct 24 | Apr 22 | Oct 29 |
| 2020 | May 14 | Sep 20 | Apr 23 | Oct 9 |
| 2019 | Apr 29 | Oct 5 | Apr 17 | Oct 5 |
| 2018 | Apr 24 | Oct 14 | Apr 23 | Oct 19 |
| 2017 | May 9 | Oct 17 | Apr 15 | Oct 17 |
| 2016 | Apr 28 | Oct 11 | Apr 28 | Oct 27 |
| 2015 | Apr 24 | Oct 18 | Apr 16 | Oct 19 |
"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.