Frost history / Glasgow #2, MT
Glasgow #2, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00243557, 1951 to 2024, measured from daily minimum temperatures.
Elevation 2,090 ft, 48.193, -106.638. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 11 | Oct 1 |
| Earliest | Apr 21 (1955) | Sep 8 (2020) |
| Latest | Jun 1 (1951) | Oct 14 (2021) |
| Trend | 1.8 days earlier per decade | 1.3 days later per decade |
| Years with data | 32 | 32 |
At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 4.
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 |
|---|---|---|---|---|
| 2024 | May 4 | Oct 13 | May 2 | Oct 24 |
| 2023 | Apr 23 | Oct 6 | Apr 23 | Oct 6 |
| 2022 | May 22 | Oct 7 | Apr 26 | Oct 26 |
| 2021 | May 10 | Oct 14 | Apr 21 | Oct 15 |
| 2020 | May 11 | Sep 8 | Apr 19 | Oct 1 |
| 2019 | May 9 | Oct 8 | May 1 | Oct 9 |
| 2018 | Apr 24 | Sep 28 | Apr 15 | Sep 28 |
| 2017 | May 2 | Oct 3 | Apr 17 | Oct 4 |
| 2016 | May 14 | Sep 13 | Apr 17 | Sep 13 |
| 2015 | May 19 | Oct 6 | Apr 20 | Oct 16 |
| 2014 | May 14 | Oct 2 | May 14 | Oct 3 |
| 2013 | May 11 | Oct 4 | May 2 | Oct 4 |
| 2012 | May 11 | Oct 1 | Apr 10 | Oct 5 |
| 2011 | no data | Oct 14 | no data | Oct 16 |
| 2009 | May 16 | Sep 28 | Apr 25 | Oct 8 |
| 2008 | May 4 | no data | Apr 27 | no data |
| 2007 | Apr 22 | Sep 14 | Apr 13 | Oct 27 |
| 2006 | May 5 | Oct 9 | Apr 24 | Oct 9 |
| 2005 | May 14 | Sep 28 | May 3 | Oct 22 |
| 2004 | no data | Oct 1 | no data | Oct 1 |
| 2003 | May 11 | Sep 30 | Apr 7 | Sep 30 |
| 2002 | May 23 | Sep 22 | May 10 | Oct 2 |
| 2001 | May 21 | Oct 3 | Apr 22 | Oct 3 |
| 2000 | May 12 | Sep 23 | Apr 16 | Sep 24 |
| 1999 | May 11 | Sep 27 | Apr 17 | Oct 2 |
| 1998 | May 7 | Oct 13 | Apr 19 | Oct 19 |
| 1997 | May 2 | Sep 19 | Apr 13 | Oct 9 |
| 1996 | May 9 | Sep 27 | Apr 28 | Oct 16 |
| 1995 | May 13 | Sep 20 | Apr 27 | Sep 21 |
| 1955 | Apr 21 | no data | Apr 6 | no data |
| 1954 | May 31 | Sep 29 | May 3 | Sep 29 |
| 1953 | May 15 | Sep 21 | May 13 | Oct 3 |
| 1952 | May 28 | Oct 3 | Apr 10 | Oct 3 |
| 1951 | Jun 1 | Sep 16 | Apr 24 | Sep 27 |
"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.