Frost history / Tamworth 4, NH
Tamworth 4, NH: frost dates by year
Last spring and first fall frost at NOAA station USC00278614, 2001 to 2025, measured from daily minimum temperatures.
Elevation 541 ft, 43.864, -71.266. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 14 | Sep 26 |
| Earliest | Apr 28 (2024) | Sep 12 (2006) |
| Latest | Jun 4 (2002) | Oct 24 (2023) |
| Trend | 4.4 days earlier per decade | 3.2 days later per decade |
| Years with data | 25 | 25 |
At 28°F (hard freeze) the median last spring date is May 7 and the median first fall date is Oct 9.
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 | May 1 | Sep 21 | Apr 21 | Oct 10 |
| 2024 | Apr 28 | Oct 15 | Apr 27 | Oct 17 |
| 2023 | May 19 | Oct 24 | May 18 | Oct 31 |
| 2022 | May 11 | Sep 30 | Apr 22 | Oct 3 |
| 2021 | May 13 | Oct 24 | May 7 | Oct 24 |
| 2020 | Jun 2 | Sep 19 | May 13 | Sep 20 |
| 2019 | May 9 | Sep 19 | May 9 | Oct 5 |
| 2018 | May 19 | Sep 23 | May 12 | Oct 14 |
| 2017 | May 21 | Oct 1 | May 9 | Oct 13 |
| 2016 | May 11 | Sep 26 | Apr 30 | Sep 26 |
| 2015 | May 23 | Sep 27 | Apr 24 | Oct 5 |
| 2014 | May 29 | Sep 15 | May 8 | Sep 19 |
| 2013 | May 28 | Sep 17 | May 15 | Oct 9 |
| 2012 | May 12 | Sep 17 | Apr 29 | Oct 13 |
| 2011 | May 2 | Oct 6 | Apr 22 | Oct 6 |
| 2010 | May 13 | Oct 3 | May 13 | Oct 14 |
| 2009 | May 26 | Sep 20 | May 19 | Sep 20 |
| 2008 | May 11 | Sep 19 | May 2 | Oct 18 |
| 2007 | May 23 | Sep 17 | May 14 | Oct 17 |
| 2006 | May 8 | Sep 12 | Apr 30 | Oct 7 |
| 2005 | May 13 | Oct 21 | May 13 | Oct 22 |
| 2004 | May 31 | Oct 4 | May 5 | Oct 6 |
| 2003 | May 18 | Oct 4 | May 4 | Oct 7 |
| 2002 | Jun 4 | Oct 8 | May 20 | Oct 9 |
| 2001 | May 14 | Sep 15 | Apr 30 | Oct 9 |
"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.