Frost history / Bath, ME
Bath, ME: frost dates by year
Last spring and first fall frost at NOAA station USC00170409, 2011 to 2025, measured from daily minimum temperatures.
Elevation 25 ft, 43.932, -69.856. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 8 | Oct 8 |
| Earliest | Apr 20 (2017) | Sep 20 (2020) |
| Latest | May 24 (2020) | Oct 24 (2023) |
| Trend | 2.3 days later per decade | 3.4 days later per decade |
| Years with data | 15 | 14 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 17.
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 24 | Oct 10 | Apr 18 | Oct 10 |
| 2024 | May 11 | Oct 17 | Apr 27 | Oct 17 |
| 2023 | May 18 | Oct 24 | Apr 11 | Nov 2 |
| 2022 | May 11 | Sep 30 | Apr 24 | Oct 9 |
| 2021 | May 7 | no data | Apr 15 | no data |
| 2020 | May 24 | Sep 20 | Apr 25 | Oct 12 |
| 2019 | May 1 | Oct 5 | Apr 30 | Oct 21 |
| 2018 | May 12 | Oct 14 | Apr 24 | Oct 19 |
| 2017 | Apr 20 | Oct 1 | Apr 19 | Oct 17 |
| 2016 | May 9 | Sep 26 | Apr 29 | Oct 15 |
| 2015 | Apr 26 | Sep 28 | Apr 17 | Oct 18 |
| 2014 | May 8 | Oct 12 | Apr 21 | Nov 4 |
| 2013 | May 16 | Oct 9 | Apr 24 | Oct 26 |
| 2012 | May 7 | Oct 13 | May 1 | Oct 13 |
| 2011 | May 2 | Oct 7 | Apr 23 | Oct 7 |
"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.