Frost history / Bismarck 2.4 Nnw, ND
Bismarck 2.4 Nnw, ND: frost dates by year
Last spring and first fall frost at NOAA station USC00320817, 2007 to 2019, measured from daily minimum temperatures.
Elevation 1,831 ft, 46.834, -100.797. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 10 | Oct 5 |
| Earliest | Apr 23 (2016) | Sep 15 (2011) |
| Latest | May 31 (2012) | Oct 16 (2015) |
| Trend | 11.0 days earlier per decade | 0.7 days later per decade |
| Years with data | 12 | 12 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 16.
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 10 | no data |
| 2018 | Apr 29 | Sep 28 | Apr 20 | Oct 4 |
| 2017 | Apr 30 | Oct 9 | Apr 28 | Oct 13 |
| 2016 | Apr 23 | Oct 6 | Apr 14 | Oct 13 |
| 2015 | May 20 | Oct 16 | May 20 | Nov 7 |
| 2014 | May 16 | Oct 4 | May 16 | Oct 4 |
| 2013 | May 13 | Oct 5 | May 5 | Oct 21 |
| 2012 | May 31 | Sep 22 | Apr 17 | Oct 5 |
| 2011 | May 3 | Sep 15 | May 3 | Oct 19 |
| 2010 | May 9 | Sep 18 | May 8 | Oct 22 |
| 2009 | May 17 | Oct 6 | May 17 | Oct 9 |
| 2008 | May 11 | Oct 13 | May 4 | Oct 20 |
| 2007 | no data | Oct 12 | no data | Nov 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.