Frost history / Stanley, IA
Stanley, IA: frost dates by year
Last spring and first fall frost at NOAA station USC00137892, 2006 to 2025, measured from daily minimum temperatures.
Elevation 1,114 ft, 42.633, -91.863. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 4 | Oct 2 |
| Earliest | Apr 17 (2025) | Sep 7 (2025) |
| Latest | May 18 (2014) | Oct 16 (2021) |
| Trend | 2.5 days earlier per decade | 3.3 days later per decade |
| Years with data | 19 | 19 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 16.
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 17 | Sep 7 | Apr 16 | Oct 23 |
| 2024 | Apr 24 | Oct 7 | Apr 22 | Oct 16 |
| 2023 | May 3 | Oct 9 | Apr 27 | Oct 10 |
| 2022 | May 4 | Sep 28 | Apr 20 | Oct 8 |
| 2021 | May 12 | Oct 16 | Apr 25 | Oct 23 |
| 2020 | May 12 | Oct 2 | May 12 | Oct 2 |
| 2019 | May 12 | Oct 12 | Apr 29 | Oct 12 |
| 2018 | Apr 29 | Sep 29 | Apr 29 | Oct 16 |
| 2017 | May 4 | Oct 16 | Apr 29 | Oct 29 |
| 2016 | May 15 | no data | Apr 13 | no data |
| 2015 | May 1 | Oct 14 | Apr 24 | Oct 17 |
| 2014 | May 18 | Sep 13 | May 18 | Oct 5 |
| 2013 | May 14 | Oct 13 | Apr 24 | Oct 20 |
| 2012 | Apr 21 | Sep 23 | Apr 13 | Sep 23 |
| 2011 | May 5 | Oct 1 | May 4 | Oct 21 |
| 2010 | May 10 | Oct 3 | May 10 | Oct 19 |
| 2009 | May 17 | Oct 5 | Apr 16 | Oct 10 |
| 2008 | May 4 | Oct 2 | Apr 14 | Oct 18 |
| 2007 | Apr 18 | Sep 15 | Apr 14 | Oct 23 |
| 2006 | no data | Sep 20 | no data | Oct 12 |
"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.