Frost history / Downey, ID
Downey, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00102667, 2014 to 2025, measured from daily minimum temperatures.
Elevation 4,865 ft, 42.426, -112.125. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 27 |
| Earliest | Apr 29 (2015) | Sep 2 (2020) |
| Latest | Jun 23 (2019) | Oct 14 (2022) |
| Trend | 14.4 days later per decade | 7.0 days later per decade |
| Years with data | 11 | 12 |
At 28°F (hard freeze) the median last spring date is May 11 and the median first fall date is Oct 7.
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 17 | Oct 6 | May 1 | Oct 7 |
| 2024 | Jun 19 | Oct 1 | May 26 | Oct 19 |
| 2023 | May 10 | Sep 25 | Apr 29 | Oct 27 |
| 2022 | Jun 16 | Oct 14 | May 24 | Oct 15 |
| 2021 | Jun 12 | Sep 21 | May 12 | Oct 1 |
| 2020 | May 23 | Sep 2 | May 9 | Sep 11 |
| 2019 | Jun 23 | Sep 30 | May 11 | Oct 1 |
| 2018 | Jun 12 | Sep 4 | May 3 | Sep 26 |
| 2017 | May 21 | Sep 23 | May 19 | Sep 23 |
| 2016 | May 24 | Sep 7 | May 12 | Oct 6 |
| 2015 | Apr 29 | Oct 12 | Apr 9 | Oct 28 |
| 2014 | no data | Oct 2 | no data | Oct 14 |
"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.