Frost history / Tuttle 12NNE, ND
Tuttle 12NNE, ND: frost dates by year
Last spring and first fall frost at NOAA station USC00328853, 1999 to 2012, measured from daily minimum temperatures.
Elevation 2,100 ft, 47.301, -99.919. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 18 | Sep 23 |
| Earliest | Apr 24 (2001) | Sep 14 (2007) |
| Latest | Jun 21 (2004) | Oct 13 (2008) |
| Trend | 5.1 days later per decade | 0.6 days earlier per decade |
| Years with data | 14 | 13 |
At 28°F (hard freeze) the median last spring date is May 6 and the median first fall date is Oct 6.
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 |
|---|---|---|---|---|
| 2012 | May 31 | Sep 22 | Apr 27 | Sep 22 |
| 2011 | May 14 | Sep 14 | May 3 | Oct 18 |
| 2010 | May 9 | Sep 18 | May 8 | Oct 21 |
| 2009 | May 19 | Oct 8 | May 17 | Oct 9 |
| 2008 | May 27 | Oct 13 | May 3 | Oct 14 |
| 2007 | May 26 | Sep 14 | Apr 13 | Oct 13 |
| 2006 | May 13 | Sep 28 | May 11 | Oct 11 |
| 2005 | May 16 | Oct 5 | May 16 | Oct 6 |
| 2004 | Jun 21 | Oct 1 | Jun 21 | Oct 1 |
| 2003 | Jun 13 | Sep 16 | Jun 7 | Sep 24 |
| 2002 | May 24 | Sep 16 | May 24 | Sep 23 |
| 2001 | Apr 24 | no data | Apr 24 | no data |
| 2000 | May 14 | Sep 23 | Apr 20 | Sep 24 |
| 1999 | May 8 | Sep 29 | Apr 16 | Oct 1 |
"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.