Alva 1W, OK: frost dates by year

Last spring and first fall frost at NOAA station USC00340193, 1951 to 2008, measured from daily minimum temperatures.

Elevation 1,464 ft, 36.801, -98.688. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 10	Oct 27
Earliest	Mar 21 (1963)	Sep 24 (1989)
Latest	May 4 (2005)	Nov 20 (1999)
Trend	little change (less than half a day per decade)	little change (less than half a day per decade)
Years with data	48	48

At 28°F (hard freeze) the median last spring date is Mar 31 and the median first fall date is Nov 5.

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
2008	Apr 15	Oct 27	Mar 12	Oct 27
2007	no data	Oct 23	no data	Oct 23
2006	Apr 10	Oct 22	Mar 29	Oct 23
2005	May 4	Oct 24	Apr 1	Oct 24
2004	Apr 13	Nov 4	Apr 12	Nov 4
2003	Apr 12	Oct 26	Apr 12	Nov 7
2002	Apr 5	Nov 4	Apr 5	Nov 25
2001	Mar 25	Oct 26	Mar 18	Nov 20
2000	Apr 8	no data	Mar 17	no data
1999	Apr 17	Nov 20	Mar 15	Nov 24
1998	Apr 4	Nov 11	Mar 21	Dec 8
1997	Apr 14	Oct 26	Apr 13	Oct 27
1996	Apr 15	Nov 2	Apr 6	Nov 11
1995	Apr 12	Oct 24	Apr 11	Nov 3
1994	Apr 7	Oct 27	Apr 6	Nov 16
1993	Apr 2	Oct 21	Mar 23	Oct 27
1992	Apr 3	Oct 17	Mar 23	Nov 5
1991	Mar 31	Oct 29	Mar 16	Oct 29
1990	Apr 12	Oct 10	Mar 27	Nov 5
1989	Apr 11	Sep 24	Apr 11	Oct 19
1980	Apr 14	Oct 28	Mar 8	Oct 29
1979	Apr 6	Nov 6	Apr 4	Nov 10
1978	Mar 26	Nov 7	Mar 25	Nov 20
1977	Apr 5	Nov 10	Mar 31	Nov 10
1976	Mar 21	Oct 17	Mar 14	Oct 20
1975	Apr 4	Oct 25	Apr 3	Oct 25
1974	Mar 25	Nov 6	Mar 25	Nov 14
1973	Apr 10	Oct 29	Apr 10	Dec 6
1972	Apr 4	Oct 19	Apr 4	Nov 19
1971	Apr 7	Nov 6	Apr 6	Nov 7
1970	Apr 14	Oct 28	Apr 5	Nov 12
1969	Mar 30	Oct 14	Mar 30	Nov 4
1968	Apr 5	Nov 8	Apr 5	Nov 11
1967	Apr 27	Nov 3	Mar 18	Nov 4
1966	Apr 21	Oct 16	Apr 21	Nov 2
1965	Apr 28	Nov 17	Mar 31	Nov 29
1964	Apr 9	Oct 20	Apr 8	Nov 20
1963	Mar 21	Nov 13	Mar 14	Nov 13
1962	Apr 3	Nov 4	Apr 2	Nov 5
1961	Apr 10	Oct 26	Mar 9	Nov 3
1960	Apr 3	Oct 20	Mar 23	Nov 9
1959	Apr 22	Oct 27	Mar 22	Nov 5
1958	Apr 7	Nov 3	Mar 21	Nov 18
1957	Apr 14	Oct 25	Apr 14	Oct 26
1956	Apr 11	Nov 8	Mar 20	Nov 8
1955	Mar 29	Oct 24	Mar 28	Nov 3
1954	May 3	Oct 30	Apr 1	Nov 2
1953	Apr 20	Oct 7	Apr 20	Nov 9
1952	no data	Oct 7	no data	Oct 7
1951	Apr 23	no data	Apr 12	no data

"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.