Frost history / Judith Gap, MT
Judith Gap, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00244538, 2000 to 2022, measured from daily minimum temperatures.
Elevation 4,630 ft, 46.678, -109.751. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 20 |
| Earliest | May 10 (2013) | Aug 23 (2015) |
| Latest | Jun 25 (2003) | Oct 4 (2016) |
| Trend | 7.5 days earlier per decade | 1.5 days earlier per decade |
| Years with data | 15 | 14 |
At 28°F (hard freeze) the median last spring date is May 10 and the median first fall date is Oct 3.
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 |
|---|---|---|---|---|
| 2022 | no data | Sep 11 | no data | Oct 24 |
| 2020 | May 15 | no data | Apr 26 | no data |
| 2019 | Jun 9 | Sep 28 | May 10 | Sep 29 |
| 2017 | May 27 | Sep 17 | May 3 | Sep 25 |
| 2016 | May 14 | Oct 4 | Apr 29 | Oct 6 |
| 2015 | May 21 | Aug 23 | May 11 | Oct 16 |
| 2014 | May 14 | Sep 10 | May 12 | Sep 12 |
| 2013 | May 10 | Sep 26 | May 1 | Oct 5 |
| 2012 | Jun 17 | Oct 3 | May 12 | Oct 5 |
| 2007 | May 24 | no data | Apr 22 | no data |
| 2006 | May 11 | Sep 1 | May 5 | Oct 10 |
| 2005 | Jun 18 | no data | Jun 10 | no data |
| 2004 | Jun 1 | Sep 20 | May 25 | Oct 1 |
| 2003 | Jun 25 | Sep 12 | May 20 | Sep 18 |
| 2002 | May 24 | Sep 21 | May 23 | Oct 2 |
| 2001 | May 30 | Oct 4 | May 7 | Oct 5 |
| 2000 | no data | Sep 20 | no data | Sep 20 |
"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.