Frost history / Belle Fourche 22 Nnw, SD
Belle Fourche 22 Nnw, SD: frost dates by year
Last spring and first fall frost at NOAA station USC00390565, 1980 to 2025, measured from daily minimum temperatures.
Elevation 3,200 ft, 44.991, -103.934. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 14 | Sep 22 |
| Earliest | Apr 23 (1987) | Sep 7 (1986) |
| Latest | Jun 30 (1995) | Oct 14 (2021) |
| Trend | 1.1 days earlier per decade | 3.8 days later per decade |
| Years with data | 30 | 31 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 3.
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 | no data | Apr 20 | no data |
| 2024 | May 4 | Oct 1 | May 4 | Oct 14 |
| 2023 | May 19 | Oct 6 | May 1 | Oct 6 |
| 2022 | May 22 | Oct 7 | May 22 | Oct 15 |
| 2021 | May 28 | Oct 14 | May 4 | Oct 21 |
| 2020 | May 17 | Sep 9 | Apr 29 | Sep 9 |
| 2019 | May 12 | Oct 3 | May 2 | Oct 3 |
| 2018 | Apr 25 | Sep 19 | Apr 17 | Oct 3 |
| 2017 | May 4 | no data | Apr 30 | no data |
| 2016 | May 15 | Oct 5 | May 14 | Oct 6 |
| 2012 | no data | Sep 26 | no data | Oct 5 |
| 2011 | no data | Sep 22 | no data | Oct 16 |
| 2010 | May 5 | no data | Apr 27 | no data |
| 2000 | May 18 | Sep 23 | May 14 | Sep 24 |
| 1999 | May 12 | Sep 14 | May 7 | Sep 20 |
| 1998 | May 7 | Oct 12 | May 7 | Oct 12 |
| 1997 | May 19 | Sep 20 | May 9 | Sep 20 |
| 1996 | May 11 | Sep 24 | May 5 | Oct 15 |
| 1995 | Jun 30 | Sep 21 | Apr 28 | Sep 21 |
| 1994 | May 1 | Oct 9 | Apr 29 | Oct 23 |
| 1993 | Jun 4 | Sep 13 | May 1 | Sep 14 |
| 1992 | May 26 | Sep 10 | May 17 | Sep 18 |
| 1991 | May 6 | Sep 18 | May 6 | Sep 18 |
| 1990 | May 19 | Sep 22 | May 10 | Sep 23 |
| 1989 | May 6 | Sep 11 | May 6 | Sep 11 |
| 1988 | May 4 | Sep 23 | Apr 28 | Oct 5 |
| 1987 | Apr 23 | Sep 22 | Apr 23 | Oct 7 |
| 1986 | May 18 | Sep 7 | May 18 | Oct 11 |
| 1985 | Jun 12 | Sep 20 | May 6 | Sep 23 |
| 1984 | no data | Sep 23 | no data | Sep 24 |
| 1983 | May 30 | Sep 12 | May 18 | Sep 20 |
| 1982 | May 6 | Sep 20 | May 6 | Oct 7 |
| 1981 | May 14 | Sep 16 | Apr 19 | Sep 27 |
| 1980 | no data | Sep 9 | no data | Oct 11 |
"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.