Frost history / Port Allegany, PA
Port Allegany, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00367103, 2005 to 2025, measured from daily minimum temperatures.
Elevation 1,475 ft, 41.816, -78.287. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Oct 10 |
| Earliest | Apr 26 (2024) | Sep 18 (2009) |
| Latest | Jun 14 (2020) | Oct 28 (2007) |
| Trend | little change (less than half a day per decade) | 0.7 days earlier per decade |
| Years with data | 19 | 21 |
At 28°F (hard freeze) the median last spring date is May 2 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 | Jun 2 | Oct 9 | Apr 17 | Oct 10 |
| 2024 | Apr 26 | Oct 11 | Apr 26 | Oct 18 |
| 2023 | May 26 | Oct 23 | May 18 | Oct 23 |
| 2022 | May 10 | Oct 3 | Apr 30 | Oct 21 |
| 2021 | no data | Oct 19 | no data | Nov 4 |
| 2020 | Jun 14 | Sep 19 | May 13 | Sep 19 |
| 2019 | May 15 | Oct 5 | Apr 29 | Oct 19 |
| 2018 | May 1 | Oct 16 | May 1 | Oct 19 |
| 2017 | Jun 9 | Oct 1 | May 11 | Oct 17 |
| 2016 | May 20 | Oct 10 | Apr 25 | Oct 15 |
| 2015 | May 23 | Oct 11 | May 23 | Oct 18 |
| 2014 | May 19 | Oct 5 | May 5 | Oct 27 |
| 2013 | May 27 | Oct 10 | May 14 | Oct 26 |
| 2012 | May 12 | Oct 9 | Apr 30 | Oct 13 |
| 2011 | May 9 | Oct 23 | Apr 22 | Oct 28 |
| 2010 | May 12 | Oct 13 | May 11 | Oct 23 |
| 2009 | May 20 | Sep 18 | May 19 | Oct 11 |
| 2008 | May 29 | Oct 4 | May 2 | Oct 7 |
| 2007 | May 19 | Oct 28 | Apr 21 | Oct 28 |
| 2006 | May 23 | Sep 30 | May 6 | Oct 13 |
| 2005 | no data | Oct 20 | no data | Oct 28 |
"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 1991–2020 frost probabilities.