Washington, MO: frost dates by year

Last spring and first fall frost at NOAA station USC00238746, 2009 to 2025, measured from daily minimum temperatures.

Elevation 487 ft, 38.542, -90.975. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 16	Oct 22
Earliest	Mar 17 (2017)	Oct 5 (2020)
Latest	Apr 25 (2023)	Nov 10 (2025)
Trend	10.0 days later per decade	2.8 days later per decade
Years with data	16	17

At 28°F (hard freeze) the median last spring date is Mar 29 and the median first fall date is Oct 31.

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 12	Nov 10	Mar 22	Nov 10
2024	Apr 22	Oct 16	Mar 29	Nov 26
2023	Apr 25	Oct 30	Mar 30	Oct 31
2022	Apr 19	Oct 14	Mar 13	Oct 19
2021	Apr 23	Nov 3	Apr 22	Nov 4
2020	Apr 18	Oct 5	Apr 18	Oct 16
2019	Apr 16	Oct 12	Apr 1	Nov 1
2018	Apr 21	Oct 22	Apr 17	Oct 22
2017	Mar 17	Oct 29	Mar 16	Oct 29
2016	Apr 12	Nov 10	Mar 22	Nov 13
2015	Apr 5	Oct 18	Apr 5	Nov 9
2014	Apr 16	Nov 1	Mar 31	Nov 1
2013	Apr 21	Oct 22	Apr 4	Oct 25
2012	Apr 13	Oct 8	Mar 11	Oct 29
2011	Apr 6	Oct 21	Mar 28	Nov 11
2010	Mar 30	Oct 29	Mar 7	Oct 29
2009	no data	Oct 18	no data	Oct 19

"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.