Frost history / Aurora, AK
Aurora, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00500490, 2005 to 2025, measured from daily minimum temperatures.
Elevation 443 ft, 64.855, -147.722. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 18 | Sep 3 |
| Earliest | May 6 (2005) | Aug 12 (2009) |
| Latest | Jun 12 (2018) | Sep 24 (2025) |
| Trend | 1.9 days later per decade | 9.4 days later per decade |
| Years with data | 20 | 21 |
At 28°F (hard freeze) the median last spring date is May 8 and the median first fall date is Sep 21.
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 17 | Sep 24 | May 17 | Sep 30 |
| 2024 | May 15 | Sep 3 | May 8 | Sep 28 |
| 2023 | Jun 1 | Sep 22 | May 7 | Sep 23 |
| 2022 | May 25 | Sep 11 | May 14 | Sep 23 |
| 2021 | May 24 | Sep 12 | May 2 | Sep 15 |
| 2020 | May 18 | Sep 6 | May 18 | Sep 13 |
| 2019 | May 7 | Aug 25 | May 7 | Sep 23 |
| 2018 | Jun 12 | Sep 1 | May 6 | Sep 9 |
| 2017 | May 28 | Sep 3 | May 2 | Oct 11 |
| 2016 | May 10 | Sep 3 | May 5 | Sep 8 |
| 2015 | May 11 | Aug 31 | May 6 | Sep 2 |
| 2014 | May 21 | Aug 30 | May 14 | Aug 30 |
| 2013 | May 22 | Aug 25 | May 21 | Aug 25 |
| 2012 | May 17 | Aug 22 | May 16 | Sep 8 |
| 2011 | May 15 | Sep 5 | May 10 | Sep 25 |
| 2010 | May 14 | Sep 12 | May 14 | Sep 20 |
| 2009 | May 19 | Aug 12 | Apr 22 | Sep 24 |
| 2008 | no data | Aug 31 | no data | Sep 21 |
| 2007 | May 19 | Sep 18 | May 10 | Sep 22 |
| 2006 | Jun 7 | Aug 24 | May 8 | Sep 25 |
| 2005 | May 6 | Aug 19 | Apr 23 | Sep 2 |
"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.