Frost history / Massacre Rocks Sp, ID
Massacre Rocks Sp, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00105678, 1973 to 2025, measured from daily minimum temperatures.
Elevation 4,195 ft, 42.668, -112.998. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 22 | Sep 29 |
| Earliest | Apr 28 (2015) | Aug 25 (1992) |
| Latest | Jul 18 (1987) | Oct 28 (2014) |
| Trend | 3.6 days earlier per decade | 4.1 days later per decade |
| Years with data | 36 | 30 |
At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 8.
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 2 | Oct 7 | Apr 23 | Oct 22 |
| 2024 | Jun 19 | Oct 19 | May 3 | Oct 20 |
| 2023 | May 9 | no data | Apr 24 | no data |
| 2022 | May 24 | Oct 17 | May 24 | Oct 27 |
| 2021 | May 12 | Sep 29 | May 12 | Oct 14 |
| 2020 | May 17 | Sep 10 | May 6 | Oct 23 |
| 2019 | Jun 10 | Sep 29 | May 11 | Oct 6 |
| 2018 | May 2 | Sep 24 | May 2 | Sep 26 |
| 2017 | May 20 | Sep 23 | May 18 | Oct 3 |
| 2016 | May 12 | Oct 5 | Apr 18 | Oct 12 |
| 2015 | Apr 28 | Oct 27 | Apr 4 | Nov 7 |
| 2014 | May 14 | Oct 28 | Mar 21 | Oct 29 |
| 2013 | May 3 | Oct 5 | May 2 | Oct 19 |
| 2012 | May 13 | Sep 22 | May 8 | Sep 22 |
| 2011 | Jun 3 | Oct 18 | May 2 | Oct 26 |
| 2010 | no data | Oct 12 | no data | Oct 13 |
| 2009 | no data | Oct 2 | no data | Oct 7 |
| 2006 | May 12 | no data | May 12 | no data |
| 2005 | no data | Sep 27 | no data | Oct 7 |
| 1998 | Jun 5 | Oct 4 | Apr 26 | Oct 4 |
| 1997 | May 9 | no data | May 2 | no data |
| 1996 | May 26 | no data | Apr 28 | no data |
| 1995 | Jun 7 | Sep 21 | Apr 23 | Sep 22 |
| 1994 | Apr 30 | Oct 8 | Apr 30 | Oct 22 |
| 1993 | May 9 | Sep 13 | May 6 | Sep 22 |
| 1992 | May 2 | Aug 25 | Apr 24 | Oct 7 |
| 1990 | May 25 | no data | Apr 30 | no data |
| 1989 | May 25 | no data | Apr 26 | no data |
| 1987 | Jul 18 | no data | Apr 13 | no data |
| 1983 | May 15 | no data | May 15 | no data |
| 1982 | May 31 | Oct 6 | May 29 | Oct 9 |
| 1981 | May 13 | Sep 23 | May 13 | Oct 1 |
| 1980 | May 25 | Sep 22 | Apr 12 | Oct 10 |
| 1979 | May 30 | Sep 12 | May 30 | Oct 27 |
| 1978 | May 31 | Sep 19 | Apr 18 | Sep 20 |
| 1977 | May 30 | no data | Apr 18 | no data |
| 1976 | Jun 26 | Sep 8 | Apr 30 | Sep 9 |
| 1975 | May 29 | no data | May 25 | no data |
| 1974 | Jun 8 | Sep 13 | May 16 | Sep 13 |
| 1973 | no data | Oct 3 | no data | Oct 3 |
"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.