Frost history / Sioux City Ang, IA
Sioux City Ang, IA: frost dates by year
Last spring and first fall frost at NOAA station USC00137702, 2011 to 2025, measured from daily minimum temperatures.
Elevation 1,100 ft, 42.396, -96.378. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 27 | Oct 13 |
| Earliest | Apr 13 (2012) | Sep 23 (2012) |
| Latest | May 23 (2022) | Oct 22 (2025) |
| Trend | 0.8 days earlier per decade | 5.4 days later per decade |
| Years with data | 15 | 15 |
At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 20.
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 20 | Oct 22 | Apr 9 | Nov 2 |
| 2024 | Apr 22 | Oct 15 | Apr 22 | Oct 17 |
| 2023 | Apr 27 | Oct 11 | Apr 24 | Oct 28 |
| 2022 | May 23 | Oct 8 | Apr 27 | Oct 8 |
| 2021 | May 6 | Oct 22 | Apr 23 | Nov 1 |
| 2020 | May 13 | Oct 1 | Apr 18 | Oct 24 |
| 2019 | Apr 15 | Oct 3 | Apr 15 | Oct 4 |
| 2018 | Apr 22 | Oct 13 | Apr 20 | Oct 15 |
| 2017 | May 2 | Oct 10 | Apr 12 | Oct 12 |
| 2016 | Apr 13 | Oct 13 | Apr 12 | Oct 13 |
| 2015 | Apr 23 | Oct 17 | Apr 22 | Oct 26 |
| 2014 | May 18 | Oct 4 | May 17 | Oct 31 |
| 2013 | May 13 | Oct 14 | Apr 26 | Oct 22 |
| 2012 | Apr 13 | Sep 23 | Apr 13 | Oct 5 |
| 2011 | May 4 | Oct 17 | May 4 | Oct 20 |
"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.