Frost history / Belcourt Keya Radio, ND
Belcourt Keya Radio, ND: frost dates by year
Last spring and first fall frost at NOAA station USC00320626, 1951 to 2025, measured from daily minimum temperatures.
Elevation 1,960 ft, 48.841, -99.751. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 29 | Sep 13 |
| Earliest | May 2 (2023) | Aug 13 (1964) |
| Latest | Jul 20 (1985) | Oct 14 (2021) |
| Trend | 2.7 days earlier per decade | 2.8 days later per decade |
| Years with data | 42 | 43 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 22.
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 20 | Oct 6 | Apr 25 | Oct 7 |
| 2024 | May 7 | Oct 1 | Apr 22 | Oct 15 |
| 2023 | May 2 | Oct 7 | May 2 | Oct 10 |
| 2022 | May 21 | Sep 22 | Apr 28 | Oct 7 |
| 2021 | May 28 | Oct 14 | May 11 | Oct 21 |
| 2020 | May 12 | Sep 8 | May 12 | Oct 15 |
| 2019 | May 28 | Oct 3 | May 10 | Oct 10 |
| 2016 | May 13 | Sep 14 | Apr 22 | Oct 8 |
| 2015 | May 30 | Sep 29 | May 20 | Oct 25 |
| 2014 | May 16 | Sep 15 | May 16 | Oct 4 |
| 2013 | no data | Oct 7 | no data | Oct 7 |
| 2012 | May 31 | Sep 9 | Apr 26 | Sep 22 |
| 2007 | no data | Sep 8 | no data | Sep 9 |
| 2004 | May 18 | Aug 20 | May 18 | Oct 1 |
| 2003 | no data | Sep 19 | no data | Sep 25 |
| 2001 | May 12 | Sep 23 | Apr 24 | Oct 5 |
| 1985 | Jul 20 | no data | Apr 28 | no data |
| 1984 | May 28 | Sep 16 | May 26 | Sep 24 |
| 1983 | no data | Sep 13 | no data | Sep 22 |
| 1982 | Jun 3 | no data | May 8 | no data |
| 1981 | May 30 | Sep 16 | May 10 | Oct 6 |
| 1977 | May 7 | no data | May 7 | no data |
| 1975 | May 5 | Sep 11 | Apr 21 | Sep 12 |
| 1974 | Jun 11 | Sep 1 | May 14 | Sep 22 |
| 1973 | no data | Sep 13 | no data | Sep 16 |
| 1972 | Jun 20 | Sep 2 | May 30 | Sep 5 |
| 1971 | May 26 | Sep 15 | May 26 | Sep 19 |
| 1970 | May 26 | no data | May 5 | no data |
| 1969 | Jun 20 | Sep 11 | Jun 20 | Sep 24 |
| 1968 | Jun 15 | Aug 14 | May 18 | Oct 4 |
| 1967 | Jun 23 | Sep 24 | May 15 | Sep 27 |
| 1966 | Jun 9 | Sep 14 | May 9 | Sep 14 |
| 1965 | May 28 | Sep 5 | May 28 | Sep 19 |
| 1964 | Jun 10 | Aug 13 | Jun 1 | Sep 11 |
| 1963 | May 22 | Oct 7 | May 22 | Oct 11 |
| 1962 | Jun 1 | Sep 4 | May 6 | Sep 4 |
| 1961 | Jun 15 | Sep 3 | May 26 | Sep 23 |
| 1960 | Jun 6 | Sep 9 | May 11 | Sep 13 |
| 1959 | Jun 29 | Sep 10 | May 20 | Sep 10 |
| 1958 | Jun 24 | Aug 31 | Jun 24 | Aug 31 |
| 1957 | May 23 | Sep 16 | May 23 | Sep 19 |
| 1956 | May 15 | Aug 20 | May 7 | Sep 5 |
| 1955 | May 8 | Sep 10 | May 8 | Sep 10 |
| 1954 | Jun 4 | Sep 21 | May 29 | Sep 22 |
| 1953 | Jun 6 | Sep 6 | Jun 6 | Sep 21 |
| 1952 | Jun 1 | Sep 2 | May 29 | Sep 19 |
| 1951 | May 30 | Sep 22 | May 30 | Sep 22 |
"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.