Ardmore, OK: frost dates by year

Last spring and first fall frost at NOAA station USC00340292, 1951 to 2009, measured from daily minimum temperatures.

Elevation 841 ft, 34.177, -97.162. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 19	Nov 11
Earliest	Feb 28 (1961)	Oct 20 (1976)
Latest	Apr 13 (1997)	Dec 21 (1998)
Trend	1.1 days later per decade	2.0 days later per decade
Years with data	46	49

At 28°F (hard freeze) the median last spring date is Mar 11 and the median first fall date is Nov 27.

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
2009	Apr 6	no data	Feb 4	no data
2008	no data	Nov 16	no data	Nov 21
2004	no data	Dec 1	no data	Dec 14
2002	no data	Nov 26	no data	Nov 26
2001	no data	Nov 26	no data	Nov 27
1999	Mar 15	no data	Jan 15	no data
1998	Mar 13	Dec 21	Mar 13	Dec 22
1997	Apr 13	Nov 12	Jan 30	Dec 5
1996	Mar 27	Nov 24	Mar 27	Nov 25
1995	Mar 9	Nov 4	Mar 9	Nov 11
1994	Apr 6	Nov 28	Mar 10	Nov 30
1993	Mar 14	Oct 29	Mar 14	Oct 30
1992	Mar 23	Nov 5	Mar 11	Nov 5
1991	Mar 14	Nov 1	Feb 20	Nov 1
1990	no data	Nov 5	no data	Dec 4
1988	Mar 30	Nov 21	Mar 19	Nov 28
1987	Apr 3	Nov 11	Mar 30	Dec 15
1986	Mar 1	Nov 11	Feb 22	Nov 11
1985	Mar 31	Nov 20	Feb 15	Nov 20
1984	Mar 21	Nov 21	Mar 9	Dec 3
1983	Apr 9	Nov 11	Mar 27	Nov 24
1982	Mar 8	Nov 4	Mar 8	Nov 13
1980	Mar 6	Nov 17	Mar 6	Nov 19
1979	Mar 4	Nov 10	Feb 26	Nov 29
1978	Mar 9	Dec 3	Mar 5	Dec 3
1977	Feb 28	Nov 10	Feb 5	Dec 6
1976	Mar 13	Oct 20	Feb 22	Nov 12
1975	Apr 3	Nov 13	Apr 3	Nov 23
1974	Mar 24	Nov 29	Mar 24	Nov 29
1973	Apr 10	Dec 5	Feb 17	Dec 10
1972	Mar 2	Nov 20	Mar 2	Dec 4
1971	Apr 7	Nov 19	Apr 7	none
1970	Apr 2	Nov 4	Mar 13	Nov 15
1969	Mar 13	Nov 14	Mar 11	Nov 28
1968	Mar 23	Nov 9	Mar 23	Dec 8
1967	Mar 9	Nov 4	Mar 8	Dec 3
1966	Mar 24	Nov 2	Mar 6	Nov 2
1965	Mar 27	Dec 17	Mar 26	none
1964	Mar 30	Nov 20	Mar 26	Nov 21
1963	Mar 6	Nov 24	Feb 24	Dec 11
1962	Mar 15	Dec 6	Mar 12	Dec 11
1961	Feb 28	Nov 17	Feb 19	Dec 10
1960	Mar 18	Nov 10	Mar 17	Nov 10
1959	Mar 6	Nov 6	Feb 20	Nov 6
1958	Mar 18	Nov 2	Mar 14	Nov 28
1956	Mar 16	Nov 9	Mar 16	Nov 27
1955	Mar 28	Nov 3	Mar 27	Nov 16
1954	Mar 30	Nov 2	Mar 14	Dec 13
1953	Mar 4	Nov 9	Feb 22	Dec 13
1952	Apr 10	Nov 4	Mar 23	Nov 26
1951	Mar 21	Nov 2	Mar 14	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 to 2020 frost probabilities.