Zapata 1 S, TX: frost dates by year

Last spring and first fall frost at NOAA station USC00419976, 1963 to 2007, measured from daily minimum temperatures.

Elevation 320 ft, 26.871, -99.254. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 9	Dec 13
Earliest	Jan 4 (2003)	Oct 31 (1993)
Latest	Mar 22 (1965)	Dec 27 (2001)
Trend	1.5 days earlier per decade	1.9 days later per decade
Years with data	39, 11 with no freeze	34, 13 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 11 and the median first fall date is Dec 20.

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
2007	Mar 5	none	none	none
2006	none	Dec 1	none	none
2005	none	none	none	none
2004	none	Dec 24	none	Dec 25
2003	Jan 4	no data	none	no data
2002	Mar 4	none	Jan 4	none
2001	no data	Dec 27	no data	none
2000	none	no data	none	no data
1999	Feb 14	no data	Jan 11	no data
1998	none	Dec 26	none	Dec 26
1997	Jan 15	Dec 13	none	none
1996	Mar 9	Dec 19	Jan 9	Dec 19
1995	none	none	none	none
1994	Feb 3	none	none	none
1993	none	Oct 31	none	none
1992	Jan 17	none	none	none
1991	none	none	none	none
1990	none	Dec 24	none	Dec 24
1989	Feb 9	Dec 13	none	Dec 13
1988	Jan 21	no data	none	no data
1987	none	none	none	none
1986	Feb 11	Dec 12	none	none
1983	none	no data	none	no data
1982	Feb 12	none	Jan 17	none
1980	Mar 3	no data	none	no data
1979	Jan 31	none	Jan 9	none
1978	Jan 20	Dec 9	none	Dec 10
1977	Jan 19	Dec 22	Jan 10	none
1976	Jan 30	Nov 28	Jan 9	none
1975	no data	none	no data	none
1974	Feb 26	Dec 21	Feb 9	none
1973	Feb 11	Dec 20	Feb 10	Dec 21
1972	Feb 4	Dec 16	Feb 4	Dec 16
1971	Feb 9	none	none	none
1970	Feb 3	Nov 24	Jan 7	none
1969	Jan 5	Nov 20	Jan 5	none
1968	Feb 24	none	none	none
1967	Feb 7	Dec 23	none	none
1966	Feb 23	Dec 11	Jan 30	Dec 12
1965	Mar 22	no data	Mar 20	no data
1964	Feb 23	no data	Jan 13	no data
1963	no data	Nov 30	no data	Dec 31

"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.