Frost history / San Antonio Incarnate Word, TX

San Antonio Incarnate Word, TX: frost dates by year

Last spring and first fall frost at NOAA station USC00417947, 1998 to 2024, measured from daily minimum temperatures.

Elevation 700 ft, 29.470, -98.473. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 19	Nov 28
Earliest	Jan 24 (2005)	Oct 29 (2017)
Latest	Mar 31 (2003)	Dec 16 (1998)
Trend	1.2 days later per decade	1.0 days earlier per decade
Years with data	20, 1 with no freeze	19

At 28°F (hard freeze) the median last spring date is Feb 13 and the median first fall date is Dec 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
2024	Feb 19	no data	Jan 20	no data
2021	no data	Dec 13	no data	none
2020	Feb 28	no data	Feb 28	no data
2019	Mar 7	no data	Jan 25	no data
2018	Feb 13	Nov 14	Feb 13	Nov 14
2017	no data	Oct 29	no data	none
2013	Feb 1	Nov 28	none	Dec 7
2012	Feb 13	Dec 11	none	none
2011	Feb 14	Nov 28	Feb 13	Dec 7
2010	Feb 26	Nov 27	Jan 12	Dec 26
2009	Feb 23	Dec 5	Jan 15	Dec 5
2008	Mar 8	Dec 2	Feb 2	none
2007	Mar 6	Nov 26	Feb 17	Dec 16
2006	Feb 20	Dec 1	Feb 20	none
2005	Jan 24	Nov 29	none	Dec 8
2004	Feb 16	Dec 1	none	Dec 15
2003	Mar 31	Nov 24	Feb 26	Dec 17
2002	Mar 6	Dec 6	Mar 6	none
2001	Feb 11	Nov 28	Jan 21	none
2000	Jan 31	Nov 19	Jan 31	Dec 13
1999	Feb 15	Nov 1	Feb 13	Dec 6
1998	none	Dec 16	none	Dec 23

"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.