Frost history / Laurin 2NE, MT
Laurin 2NE, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00244896, 2009 to 2025, measured from daily minimum temperatures.
Elevation 5,198 ft, 45.367, -112.096. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 3 | Sep 24 |
| Earliest | May 10 (2019) | Sep 4 (2014) |
| Latest | Jun 22 (2023) | Oct 23 (2022) |
| Trend | 3.4 days earlier per decade | 13.0 days later per decade |
| Years with data | 16 | 17 |
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 |
|---|---|---|---|---|
| 2025 | Jun 3 | Oct 6 | Apr 25 | Oct 6 |
| 2024 | Jun 16 | Sep 21 | May 21 | Sep 30 |
| 2023 | Jun 22 | Sep 28 | May 10 | Oct 25 |
| 2022 | May 21 | Oct 23 | Apr 18 | Nov 3 |
| 2021 | May 21 | Oct 11 | Apr 21 | Nov 8 |
| 2020 | May 24 | Sep 8 | May 8 | Sep 9 |
| 2019 | May 10 | Sep 28 | May 3 | Sep 29 |
| 2018 | Jun 12 | Sep 24 | Apr 24 | Sep 29 |
| 2017 | Jun 11 | Sep 17 | May 25 | Oct 3 |
| 2016 | May 15 | Oct 6 | May 11 | Oct 11 |
| 2015 | May 18 | Oct 5 | May 11 | Oct 23 |
| 2014 | May 30 | Sep 4 | May 12 | Sep 12 |
| 2013 | Jun 21 | Sep 26 | May 2 | Sep 26 |
| 2012 | no data | Sep 12 | no data | Sep 12 |
| 2011 | Jun 4 | Sep 20 | May 17 | Oct 17 |
| 2010 | Jun 18 | Sep 6 | May 23 | Oct 12 |
| 2009 | Jun 7 | Sep 20 | May 21 | Oct 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.