Frost history / Dearborn #2, MI
Dearborn #2, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00202016, 2007 to 2025, measured from daily minimum temperatures.
Elevation 605 ft, 42.347, -83.174. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 24 | Nov 2 |
| Earliest | Apr 2 (2019) | Oct 11 (2009) |
| Latest | May 14 (2013) | Nov 21 (2024) |
| Trend | little change (less than half a day per decade) | 10.5 days later per decade |
| Years with data | 17 | 18 |
At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Nov 10.
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 18 | Nov 3 | Apr 10 | Nov 11 |
| 2024 | no data | Nov 21 | no data | Nov 30 |
| 2023 | Apr 26 | Oct 31 | Mar 30 | Oct 31 |
| 2022 | Apr 28 | Nov 13 | Mar 29 | Nov 19 |
| 2021 | no data | Nov 3 | no data | Nov 5 |
| 2020 | May 13 | no data | May 9 | no data |
| 2019 | Apr 2 | Nov 6 | Apr 1 | Nov 6 |
| 2018 | Apr 29 | Oct 18 | Apr 18 | Nov 10 |
| 2017 | Apr 8 | Nov 5 | Mar 24 | Nov 9 |
| 2016 | Apr 15 | Nov 12 | Apr 10 | Nov 21 |
| 2015 | Apr 25 | Nov 8 | Apr 25 | Nov 22 |
| 2014 | Apr 20 | Nov 2 | Apr 17 | Nov 2 |
| 2013 | May 14 | Oct 25 | Apr 22 | Nov 12 |
| 2012 | Apr 30 | Nov 3 | Mar 27 | Nov 4 |
| 2011 | Apr 19 | Oct 29 | Apr 1 | Nov 18 |
| 2010 | Apr 11 | Oct 23 | Mar 31 | Nov 4 |
| 2009 | Apr 24 | Oct 11 | Apr 13 | Oct 18 |
| 2008 | May 1 | Oct 22 | Apr 4 | Oct 30 |
| 2007 | Apr 16 | Oct 28 | Apr 14 | Nov 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.