Osawatomie, KS: frost dates by year

Last spring and first fall frost at NOAA station USC00146084, 1951 to 2020, measured from daily minimum temperatures.

Elevation 860 ft, 38.502, -94.960. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 16	Oct 22
Earliest	Mar 11 (2012)	Oct 1 (1958)
Latest	May 4 (1954)	Nov 1 (2014)
Trend	1.4 days earlier per decade	0.5 days later per decade
Years with data	14	16

At 28°F (hard freeze) the median last spring date is Apr 8 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
2020	Apr 18	Oct 1	Apr 14	Oct 26
2019	no data	Oct 31	no data	Oct 31
2015	Apr 5	Oct 30	Apr 5	Dec 3
2014	Apr 19	Nov 1	Apr 16	Nov 1
2013	Apr 25	Oct 25	Mar 28	Oct 25
2012	Mar 11	Oct 7	Mar 10	Oct 27
2011	Apr 6	Oct 20	Mar 11	Oct 21
1959	Apr 22	Oct 9	Apr 14	Oct 18
1958	Mar 31	Oct 1	Mar 21	Nov 3
1957	Apr 14	Oct 18	Apr 13	Oct 25
1956	Apr 24	Oct 26	Apr 24	Nov 8
1955	Apr 8	Oct 15	Mar 29	Nov 3
1954	May 4	Oct 30	Apr 3	Oct 30
1953	Apr 20	Oct 29	Apr 20	Nov 6
1952	Apr 15	Oct 6	Apr 10	Oct 6
1951	no data	Oct 24	no data	Nov 2

"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.