Frost history / Tizer Gardens, MT
Tizer Gardens, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00248239, 2010 to 2021, measured from daily minimum temperatures.
Elevation 4,672 ft, 46.373, -112.022. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 27 | Sep 6 |
| Earliest | May 21 (2015) | Aug 23 (2015) |
| Latest | Jul 28 (2019) | Oct 11 (2010) |
| Trend | 33.2 days later per decade | 13.6 days earlier per decade |
| Years with data | 10 | 10 |
At 28°F (hard freeze) the median last spring date is Jun 4 and the median first fall date is Sep 19.
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 |
|---|---|---|---|---|
| 2021 | Jul 14 | no data | Jul 14 | no data |
| 2020 | Jul 7 | Sep 8 | Jul 7 | Sep 8 |
| 2019 | Jul 28 | Sep 27 | May 24 | Sep 29 |
| 2018 | Jul 5 | Aug 25 | May 2 | Sep 15 |
| 2017 | Jun 29 | Sep 15 | Jun 11 | Sep 24 |
| 2016 | no data | Aug 25 | no data | Sep 13 |
| 2015 | May 21 | Aug 23 | May 11 | Sep 28 |
| 2014 | Jun 18 | Sep 4 | May 30 | Sep 12 |
| 2013 | Jun 15 | Sep 20 | Jun 1 | Sep 27 |
| 2012 | Jun 20 | no data | Jun 7 | no data |
| 2011 | Jun 25 | Sep 3 | Jun 16 | Sep 3 |
| 2010 | no data | Oct 11 | no data | Oct 18 |
"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.