Frost history / Logan Landfill, MT
Logan Landfill, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00245123, 2008 to 2025, measured from daily minimum temperatures.
Elevation 4,243 ft, 45.876, -111.411. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 12 |
| Earliest | May 7 (2013) | Aug 24 (2015) |
| Latest | Jul 8 (2016) | Oct 8 (2023) |
| Trend | 1.4 days earlier per decade | 12.3 days later per decade |
| Years with data | 15 | 17 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Oct 2.
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 | May 22 | Sep 28 | Apr 23 | Oct 7 |
| 2024 | Jun 1 | Sep 23 | May 5 | Oct 2 |
| 2023 | May 11 | Oct 8 | Apr 29 | Oct 19 |
| 2022 | May 24 | Sep 11 | May 22 | Oct 15 |
| 2021 | May 23 | Sep 18 | May 23 | Sep 18 |
| 2020 | Jun 10 | Sep 9 | May 9 | Sep 29 |
| 2019 | no data | Sep 29 | no data | Sep 30 |
| 2018 | Jun 13 | Sep 21 | Jun 13 | Sep 26 |
| 2017 | May 27 | Sep 18 | May 15 | Oct 3 |
| 2016 | Jul 8 | Sep 11 | May 4 | Oct 7 |
| 2015 | May 12 | Aug 24 | May 12 | Oct 5 |
| 2014 | May 15 | Sep 12 | May 14 | Sep 12 |
| 2013 | May 7 | Sep 27 | May 3 | Oct 2 |
| 2012 | Jun 8 | Sep 12 | May 13 | Oct 6 |
| 2011 | Jun 5 | Sep 2 | May 12 | Sep 22 |
| 2009 | May 22 | Sep 10 | May 22 | Sep 28 |
| 2008 | no data | Sep 5 | no data | Sep 15 |
"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.