Frost history / Highwood 7 Ne, MT
Highwood 7 Ne, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00244133, 2010 to 2025, measured from daily minimum temperatures.
Elevation 3,600 ft, 47.641, -110.668. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 12 | Oct 3 |
| Earliest | Apr 18 (2018) | Sep 9 (2014) |
| Latest | May 22 (2022) | Oct 22 (2022) |
| Trend | 1.0 days earlier per decade | 6.8 days later per decade |
| Years with data | 10 | 14 |
At 28°F (hard freeze) the median last spring date is Apr 21 and the median first fall date is Oct 6.
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 | no data | Oct 6 | no data | Oct 12 |
| 2024 | May 8 | Oct 3 | May 1 | Oct 29 |
| 2023 | Apr 22 | Oct 6 | Apr 21 | Oct 24 |
| 2022 | May 22 | Oct 22 | Apr 21 | Oct 23 |
| 2021 | May 21 | Oct 3 | May 21 | Oct 4 |
| 2020 | May 11 | Oct 14 | Apr 15 | Oct 14 |
| 2019 | no data | Sep 29 | no data | Sep 30 |
| 2018 | Apr 18 | Sep 29 | Apr 12 | Sep 30 |
| 2017 | May 20 | Sep 24 | Apr 15 | Oct 2 |
| 2016 | May 14 | Sep 13 | Apr 17 | Oct 7 |
| 2015 | May 18 | Oct 4 | May 9 | Oct 5 |
| 2014 | no data | Sep 9 | no data | Oct 3 |
| 2013 | May 1 | Oct 4 | May 1 | Oct 4 |
| 2010 | no data | Oct 15 | no data | Oct 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.