Helena 1 Sse, OK: frost dates by year

Last spring and first fall frost at NOAA station USC00344019, 1961 to 2025, measured from daily minimum temperatures.

Elevation 1,350 ft, 36.538, -98.266. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 10	Oct 29
Earliest	Mar 10 (2012)	Sep 30 (1984)
Latest	May 2 (2014)	Nov 22 (2024)
Trend	little change (less than half a day per decade)	0.6 days later per decade
Years with data	62	64

At 28°F (hard freeze) the median last spring date is Apr 4 and the median first fall date is Nov 10.

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	Nov 10
2024	Mar 28	Nov 22	Mar 27	Nov 26
2023	Apr 23	Oct 29	Mar 27	Oct 30
2022	Apr 26	Oct 19	Apr 9	Nov 12
2021	Apr 22	Nov 13	Apr 21	Nov 13
2020	Apr 18	Oct 26	Apr 5	Oct 26
2019	Apr 12	Oct 29	Apr 1	Oct 29
2018	Apr 19	Oct 15	Apr 17	Nov 10
2017	Mar 16	Oct 27	Mar 16	Oct 28
2016	Apr 3	Nov 19	Apr 2	Nov 19
2015	Apr 10	Nov 13	Apr 4	Nov 22
2014	May 2	Nov 1	Apr 16	Nov 1
2013	Apr 25	Oct 19	Apr 25	Nov 12
2012	Mar 10	Oct 7	Mar 4	Oct 27
2011	Apr 5	Oct 28	Mar 15	Nov 4
2010	Apr 9	Nov 5	Apr 8	Nov 18
2009	Apr 8	Nov 18	Apr 8	Nov 18
2008	Apr 15	Oct 27	Mar 10	Nov 18
2007	Apr 14	Nov 2	Apr 8	Nov 15
2006	Mar 29	Oct 22	Mar 25	Oct 22
2005	Apr 30	Oct 24	Mar 2	Oct 24
2004	Apr 12	Nov 4	Apr 12	Nov 4
2003	Apr 10	Nov 5	Apr 10	Nov 7
2002	Apr 5	Nov 4	Apr 5	Nov 25
2001	Apr 17	Oct 16	Mar 6	Nov 20
2000	Apr 9	Oct 8	Apr 8	Oct 9
1999	Apr 17	Nov 4	Mar 16	Nov 25
1998	Mar 13	Nov 11	Mar 13	Dec 8
1997	Apr 15	Oct 27	Apr 14	Oct 27
1996	Apr 6	Nov 10	Apr 6	Nov 17
1995	Apr 13	Oct 24	Apr 12	Oct 24
1994	Apr 8	Nov 10	Mar 31	Nov 18
1993	Apr 17	Oct 21	Apr 16	Oct 27
1992	Apr 4	Nov 4	Apr 2	Nov 5
1991	Mar 30	Oct 29	Mar 16	Oct 29
1990	Apr 8	Oct 22	Mar 25	Nov 28
1989	Apr 12	Oct 19	Mar 22	Oct 19
1988	Mar 20	Nov 6	Mar 20	Nov 20
1987	Apr 5	Nov 10	Apr 5	Nov 10
1986	Apr 16	Nov 11	Mar 22	Nov 11
1985	Mar 31	Nov 7	Mar 31	Nov 20
1984	Apr 5	Sep 30	Mar 20	Nov 2
1983	Apr 15	Nov 10	Apr 15	Nov 11
1982	Apr 22	Oct 20	Apr 7	Nov 3
1981	Apr 4	Oct 23	Mar 19	Nov 20
1980	Apr 15	Oct 25	Apr 14	Oct 29
1979	Apr 6	Nov 3	Apr 4	Nov 11
1978	Apr 20	Nov 7	Mar 25	Nov 7
1977	Apr 5	Oct 12	Apr 5	Nov 10
1976	no data	Oct 17	no data	Oct 17
1975	Apr 12	Oct 16	Apr 4	Oct 25
1974	no data	Nov 6	no data	Nov 14
1973	Apr 11	Oct 29	Apr 10	Dec 5
1972	Apr 5	Oct 19	Apr 5	Nov 19
1971	Apr 14	Nov 6	Apr 7	Nov 7
1970	Apr 6	Oct 28	Apr 5	Nov 5
1969	Mar 31	Oct 14	Mar 30	Nov 4
1968	Apr 24	Oct 28	Apr 6	Nov 11
1967	May 2	Nov 1	Mar 18	Nov 4
1966	May 2	Oct 16	Apr 21	Nov 2
1965	Apr 28	Nov 13	Mar 27	Nov 27
1964	Apr 9	no data	Apr 8	no data
1963	Mar 15	Nov 2	Mar 15	Nov 13
1962	Apr 3	Nov 4	Mar 17	Dec 6
1961	no data	Nov 3	no data	Nov 3

"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 1991–2020 frost probabilities.