Frost history / Spirit Lake, IA
Spirit Lake, IA: frost dates by year
Last spring and first fall frost at NOAA station USC00137859, 1953 to 2025, measured from daily minimum temperatures.
Elevation 1,420 ft, 43.423, -95.139. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 27 | Oct 16 |
| Earliest | Apr 8 (2006) | Sep 25 (2000) |
| Latest | May 16 (2014) | Nov 12 (2016) |
| Trend | 1.4 days later per decade | 0.5 days later per decade |
| Years with data | 25 | 26 |
At 28°F (hard freeze) the median last spring date is Apr 17 and the median first fall date is Oct 27.
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 10 | Nov 9 |
| 2024 | Apr 22 | Oct 27 | Apr 22 | Nov 21 |
| 2023 | May 3 | Oct 28 | Apr 24 | Oct 28 |
| 2022 | Apr 27 | Oct 8 | Apr 27 | Oct 17 |
| 2021 | Apr 23 | Oct 23 | Apr 22 | Nov 1 |
| 2020 | Apr 22 | Oct 2 | Apr 22 | Oct 4 |
| 2019 | Apr 29 | Oct 11 | Apr 14 | Oct 14 |
| 2018 | Apr 25 | Oct 12 | Apr 21 | Oct 15 |
| 2017 | May 2 | Oct 27 | Apr 29 | Oct 28 |
| 2016 | May 14 | Nov 12 | Apr 12 | Nov 19 |
| 2015 | Apr 23 | Oct 16 | Apr 4 | Nov 20 |
| 2014 | May 16 | Oct 4 | Apr 17 | Oct 31 |
| 2013 | May 4 | Oct 18 | Apr 25 | Nov 5 |
| 2012 | Apr 11 | Oct 5 | Apr 11 | Oct 7 |
| 2011 | May 3 | Oct 18 | May 3 | Oct 19 |
| 2010 | May 9 | Oct 27 | Mar 28 | Oct 29 |
| 2009 | no data | Oct 9 | no data | Oct 9 |
| 2008 | Apr 29 | Oct 16 | Apr 28 | Oct 28 |
| 2007 | Apr 14 | Nov 1 | Apr 14 | Nov 3 |
| 2006 | Apr 8 | Oct 11 | Apr 8 | Oct 12 |
| 2005 | May 4 | Oct 22 | May 3 | Oct 24 |
| 2004 | May 14 | Oct 2 | Apr 13 | Oct 31 |
| 2003 | Apr 9 | no data | Apr 9 | no data |
| 2002 | May 2 | Oct 7 | Apr 6 | Oct 13 |
| 2001 | Apr 18 | Oct 6 | Apr 17 | Oct 6 |
| 2000 | Apr 21 | Sep 25 | Apr 10 | Oct 6 |
| 1953 | no data | Oct 25 | no data | Oct 27 |
"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.