Acme Mesonet, OK: frost dates by year

Last spring and first fall frost at NOAA station USC00340010, 2009 to 2025, measured from daily minimum temperatures.

Elevation 1,302 ft, 34.808, -98.023. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 7	Oct 29
Earliest	Mar 7 (2015)	Oct 7 (2012)
Latest	May 4 (2013)	Nov 20 (2024)
Trend	2.1 days earlier per decade	3.2 days later per decade
Years with data	17	17

At 28°F (hard freeze) the median last spring date is Mar 20 and the median first fall date is Nov 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	Apr 7	Oct 30	Mar 20	Oct 30
2024	Mar 28	Nov 20	Feb 28	Nov 26
2023	Mar 29	Oct 16	Mar 19	Oct 30
2022	Apr 14	Oct 19	Mar 12	Nov 11
2021	Apr 21	Nov 12	Apr 21	Nov 13
2020	Apr 18	Oct 24	Mar 6	Oct 26
2019	Apr 1	Oct 11	Mar 31	Oct 30
2018	Apr 16	Nov 9	Apr 7	Nov 10
2017	Mar 15	Oct 27	Mar 14	Oct 27
2016	Apr 2	Nov 18	Mar 20	Nov 19
2015	Mar 7	Nov 12	Mar 6	Nov 21
2014	Apr 15	Oct 31	Apr 15	Nov 11
2013	May 4	Oct 19	Apr 11	Nov 7
2012	Mar 9	Oct 7	Feb 25	Oct 27
2011	May 3	Nov 3	Mar 15	Nov 3
2010	Apr 8	Oct 29	Mar 22	Nov 5
2009	Apr 7	Oct 27	Apr 7	Nov 18

"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.