Frost history / Blackwell 4SSE Mesonet, OK
Blackwell 4SSE Mesonet, OK: frost dates by year
Last spring and first fall frost at NOAA station USC00340810, 2009 to 2025, measured from daily minimum temperatures.
Elevation 997 ft, 36.754, -97.254. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 11 | Oct 19 |
| Earliest | Mar 10 (2012) | Oct 4 (2014) |
| Latest | May 2 (2014) | Nov 12 (2015) |
| Trend | 6.7 days later per decade | 0.7 days later per decade |
| Years with data | 16 | 17 |
At 28°F (hard freeze) the median last spring date is Apr 3 and the median first fall date is Nov 1.
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 | Apr 7 | Oct 30 | Apr 7 | Nov 9 |
| 2024 | Apr 12 | Oct 16 | Mar 28 | Oct 16 |
| 2023 | Apr 23 | Oct 17 | Mar 29 | Oct 30 |
| 2022 | Apr 14 | Oct 18 | Apr 14 | Oct 19 |
| 2021 | Apr 21 | Oct 30 | Apr 21 | Nov 13 |
| 2020 | Apr 18 | Oct 26 | Mar 21 | Oct 26 |
| 2019 | Mar 31 | Oct 12 | Mar 16 | Oct 29 |
| 2018 | Apr 19 | Oct 16 | Apr 16 | Nov 9 |
| 2017 | Mar 15 | Oct 27 | Mar 15 | Oct 28 |
| 2016 | Apr 2 | Nov 10 | Apr 2 | Nov 19 |
| 2015 | Apr 10 | Nov 12 | Apr 4 | Nov 13 |
| 2014 | May 2 | Oct 4 | Apr 15 | Nov 1 |
| 2013 | Apr 25 | Oct 18 | Apr 24 | Nov 12 |
| 2012 | Mar 10 | Oct 7 | Mar 4 | Oct 8 |
| 2011 | Apr 5 | Oct 19 | Apr 5 | Oct 20 |
| 2010 | Apr 8 | Oct 29 | Mar 22 | Nov 18 |
| 2009 | no data | Oct 24 | no data | Nov 25 |
"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.