Frost history / Sioux Falls Wfo Ap, SD
Sioux Falls Wfo Ap, SD: frost dates by year
Last spring and first fall frost at NOAA station USC00397666, 2011 to 2025, measured from daily minimum temperatures.
Elevation 1,430 ft, 43.588, -96.730. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 26 | Oct 10 |
| Earliest | Apr 11 (2012) | Sep 15 (2011) |
| Latest | May 16 (2014) | Oct 24 (2016) |
| Trend | 4.2 days earlier per decade | 15.0 days later per decade |
| Years with data | 14 | 14 |
At 28°F (hard freeze) the median last spring date is Apr 20 and the median first fall date is Oct 18.
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 21 | Oct 22 | Apr 19 | Nov 8 |
| 2024 | Apr 21 | Oct 14 | Apr 19 | Oct 15 |
| 2023 | Apr 25 | Oct 10 | Apr 24 | Oct 27 |
| 2022 | Apr 26 | Oct 7 | Apr 26 | Oct 17 |
| 2021 | May 11 | Oct 23 | Apr 21 | Oct 31 |
| 2020 | Apr 26 | Oct 2 | Apr 17 | Oct 15 |
| 2019 | Apr 27 | Oct 11 | Apr 14 | Oct 14 |
| 2018 | Apr 25 | Oct 4 | Apr 19 | Oct 14 |
| 2017 | May 2 | Oct 10 | Apr 28 | Oct 27 |
| 2016 | May 14 | Oct 24 | Apr 12 | Nov 18 |
| 2015 | Apr 22 | Oct 16 | Apr 22 | Nov 7 |
| 2014 | May 16 | Oct 4 | May 16 | Oct 11 |
| 2012 | Apr 11 | Sep 23 | Apr 11 | Oct 5 |
| 2011 | May 3 | Sep 15 | May 2 | Oct 19 |
"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.