Frost history / E Glacier, MT
E Glacier, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00242629, 1981 to 2025, measured from daily minimum temperatures.
Elevation 4,806 ft, 48.447, -113.224. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 29 | Sep 12 |
| Earliest | May 14 (2006) | Aug 16 (2012) |
| Latest | Jul 22 (1984) | Oct 4 (2025) |
| Trend | 11.8 days earlier per decade | 3.0 days later per decade |
| Years with data | 22 | 22 |
At 28°F (hard freeze) the median last spring date is May 14 and the median first fall date is Sep 27.
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 |
|---|---|---|---|---|
| 2025 | Jun 3 | Oct 4 | May 5 | Oct 5 |
| 2024 | no data | Sep 21 | no data | Sep 21 |
| 2023 | no data | Sep 29 | no data | Oct 6 |
| 2020 | May 14 | Sep 8 | May 10 | Oct 16 |
| 2019 | May 29 | Sep 28 | May 9 | Sep 28 |
| 2018 | May 21 | Aug 28 | May 14 | Sep 20 |
| 2017 | May 26 | Sep 16 | Apr 28 | Sep 24 |
| 2016 | May 25 | Sep 13 | May 15 | Sep 13 |
| 2015 | May 21 | Aug 22 | May 18 | Sep 28 |
| 2014 | Jun 7 | Sep 4 | May 12 | Sep 11 |
| 2013 | Jun 4 | Sep 27 | May 8 | Sep 27 |
| 2012 | May 29 | Aug 16 | May 12 | Sep 12 |
| 2011 | May 31 | Sep 3 | May 18 | Sep 29 |
| 2010 | Jun 13 | Sep 2 | May 13 | Oct 16 |
| 2009 | Jun 10 | Sep 20 | Jun 9 | Sep 27 |
| 2008 | no data | Sep 8 | no data | Oct 9 |
| 2007 | May 29 | Sep 13 | May 23 | Oct 6 |
| 2006 | May 14 | no data | May 10 | no data |
| 2005 | May 30 | no data | May 24 | no data |
| 2004 | Jun 20 | Oct 1 | May 24 | Oct 1 |
| 2003 | May 20 | Aug 30 | May 20 | Sep 18 |
| 2002 | May 24 | Sep 20 | May 23 | Sep 23 |
| 2001 | May 21 | no data | May 20 | no data |
| 1999 | Jul 17 | no data | Jun 7 | no data |
| 1988 | no data | Sep 11 | no data | Sep 12 |
| 1984 | Jul 22 | no data | May 11 | no data |
| 1981 | no data | Sep 3 | no data | Sep 24 |
"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.