Frost history / Nashua #2, MT
Nashua #2, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00245983, 1999 to 2014, measured from daily minimum temperatures.
Elevation 2,067 ft, 48.132, -106.354. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 22 |
| Earliest | Apr 22 (2007) | Sep 11 (2010) |
| Latest | Jun 6 (2008) | Oct 12 (2006) |
| Trend | 2.5 days earlier per decade | 2.8 days earlier per decade |
| Years with data | 10 | 11 |
At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 1.
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 |
|---|---|---|---|---|
| 2014 | May 14 | no data | Apr 21 | no data |
| 2010 | no data | Sep 11 | no data | Sep 11 |
| 2009 | May 21 | no data | May 16 | no data |
| 2008 | Jun 6 | Sep 24 | Apr 28 | Oct 7 |
| 2007 | Apr 22 | Sep 14 | Apr 22 | Sep 14 |
| 2006 | May 11 | Oct 12 | May 5 | Oct 12 |
| 2005 | no data | Sep 28 | no data | Sep 28 |
| 2004 | May 25 | Sep 21 | May 1 | Oct 1 |
| 2003 | May 20 | Sep 14 | May 20 | Oct 1 |
| 2002 | May 24 | Sep 22 | May 17 | Sep 22 |
| 2001 | May 21 | Oct 4 | May 3 | Oct 6 |
| 2000 | May 13 | Sep 23 | Apr 19 | Sep 23 |
| 1999 | no data | Sep 15 | no data | Oct 2 |
"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.