Frost history / Jordan Ap, MT
Jordan Ap, MT: frost dates by year
Last spring and first fall frost at NOAA station USW00094051, 1998 to 2024, measured from daily minimum temperatures.
Elevation 2,662 ft, 47.326, -106.948. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 20 |
| Earliest | Apr 24 (2007) | Aug 23 (2015) |
| Latest | Jun 18 (2004) | Oct 16 (2022) |
| Trend | 2.0 days earlier per decade | 3.8 days later per decade |
| Years with data | 27 | 27 |
At 28°F (hard freeze) the median last spring date is May 11 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 31 | Oct 1 | May 4 | Oct 13 |
| 2023 | May 19 | Oct 6 | Apr 23 | Oct 6 |
| 2022 | May 22 | Oct 16 | May 22 | Oct 26 |
| 2021 | May 11 | Sep 30 | May 10 | Oct 19 |
| 2020 | May 11 | Sep 8 | May 11 | Oct 1 |
| 2019 | May 20 | Sep 30 | May 9 | Oct 9 |
| 2018 | Apr 24 | Sep 28 | Apr 15 | Sep 28 |
| 2017 | May 23 | Sep 25 | May 19 | Oct 4 |
| 2016 | May 15 | Sep 13 | May 14 | Sep 13 |
| 2015 | May 21 | Aug 23 | May 18 | Oct 16 |
| 2014 | Jun 7 | Sep 15 | May 8 | Oct 2 |
| 2013 | May 11 | Sep 20 | May 11 | Oct 4 |
| 2012 | May 29 | Sep 13 | May 25 | Oct 5 |
| 2011 | May 5 | Sep 4 | May 2 | Oct 16 |
| 2010 | May 23 | Oct 12 | May 8 | Oct 16 |
| 2009 | Jun 10 | Sep 22 | May 16 | Sep 28 |
| 2008 | May 3 | Sep 8 | May 3 | Oct 7 |
| 2007 | Apr 24 | Sep 13 | Apr 16 | Sep 14 |
| 2006 | May 11 | Oct 5 | May 5 | Oct 10 |
| 2005 | May 14 | Sep 12 | May 14 | Sep 28 |
| 2004 | Jun 18 | Sep 20 | May 25 | Sep 21 |
| 2003 | May 20 | Sep 14 | May 11 | Sep 18 |
| 2002 | May 24 | Sep 25 | May 17 | Sep 25 |
| 2001 | May 23 | Oct 3 | May 21 | Oct 4 |
| 2000 | Jun 2 | Sep 21 | May 14 | Sep 23 |
| 1999 | May 17 | Sep 9 | May 17 | Sep 15 |
| 1998 | May 19 | Sep 20 | May 12 | Oct 6 |
"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.