Frost history / Tamarac Wildlife Re, MN
Tamarac Wildlife Re, MN: frost dates by year
Last spring and first fall frost at NOAA station USC00218191, 1978 to 2017, measured from daily minimum temperatures.
Elevation 1,508 ft, 46.958, -95.655. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 10 | Sep 24 |
| Earliest | Apr 19 (2007) | Sep 7 (1979) |
| Latest | May 29 (1984) | Oct 9 (2006) |
| Trend | 4.6 days earlier per decade | 4.6 days later per decade |
| Years with data | 12 | 12 |
At 28°F (hard freeze) the median last spring date is Apr 28 and the median first fall date is Oct 7.
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 |
|---|---|---|---|---|
| 2017 | Apr 30 | no data | Apr 29 | no data |
| 2016 | May 15 | Oct 7 | May 15 | Oct 9 |
| 2007 | Apr 19 | Sep 15 | Apr 17 | Sep 15 |
| 2006 | Apr 25 | Oct 9 | Apr 10 | Oct 11 |
| 2005 | no data | Oct 6 | no data | Oct 25 |
| 1993 | Apr 26 | no data | Apr 25 | no data |
| 1991 | no data | Sep 26 | no data | Oct 6 |
| 1988 | May 13 | Oct 3 | Apr 22 | Oct 12 |
| 1984 | May 29 | Sep 11 | May 8 | Sep 15 |
| 1983 | May 25 | Sep 22 | May 17 | Sep 23 |
| 1982 | May 8 | Sep 20 | Apr 27 | Sep 25 |
| 1981 | May 20 | Sep 28 | May 10 | Sep 28 |
| 1979 | May 21 | Sep 7 | May 21 | Oct 7 |
| 1978 | May 2 | Sep 21 | Apr 25 | Oct 13 |
"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 1991–2020 frost probabilities.