Frost history / Flasher, ND
Flasher, ND: frost dates by year
Last spring and first fall frost at NOAA station USC00323004, 1999 to 2019, measured from daily minimum temperatures.
Elevation 1,980 ft, 46.458, -101.200. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Sep 27 |
| Earliest | May 3 (2018) | Sep 9 (2012) |
| Latest | May 31 (2012) | Oct 9 (2008) |
| Trend | 4.4 days earlier per decade | 2.1 days later per decade |
| Years with data | 19 | 20 |
At 28°F (hard freeze) the median last spring date is May 8 and the median first fall date is Oct 5.
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 |
|---|---|---|---|---|
| 2019 | May 10 | no data | May 7 | no data |
| 2018 | May 3 | Sep 26 | Apr 20 | Sep 28 |
| 2017 | May 21 | Oct 6 | Apr 29 | Oct 9 |
| 2016 | May 17 | Oct 6 | Apr 14 | Oct 7 |
| 2015 | May 20 | Sep 29 | May 19 | Oct 16 |
| 2014 | May 16 | Sep 14 | May 16 | Oct 4 |
| 2013 | May 12 | Oct 5 | May 12 | Oct 6 |
| 2012 | May 31 | Sep 9 | Apr 17 | Sep 22 |
| 2011 | May 15 | Sep 14 | May 3 | Sep 15 |
| 2010 | May 10 | Sep 18 | May 8 | Oct 2 |
| 2009 | May 17 | Sep 29 | May 16 | Oct 9 |
| 2008 | May 11 | Oct 9 | May 11 | Oct 9 |
| 2007 | May 27 | Oct 8 | Apr 14 | Oct 12 |
| 2006 | no data | Sep 19 | no data | Oct 10 |
| 2005 | May 15 | Oct 5 | May 15 | Oct 6 |
| 2004 | May 15 | Sep 28 | May 14 | Oct 2 |
| 2003 | May 20 | Sep 19 | May 20 | Sep 30 |
| 2002 | May 25 | Sep 22 | May 24 | Oct 9 |
| 2001 | May 25 | Oct 4 | Apr 23 | Oct 4 |
| 2000 | May 18 | Sep 23 | Apr 20 | Sep 23 |
| 1999 | no data | Sep 15 | no data | Sep 29 |
"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.