Helena, AL: frost dates by year

Last spring and first fall frost at NOAA station USC00013781, 2004 to 2021, measured from daily minimum temperatures.

Elevation 480 ft, 33.273, -86.834. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 22	Nov 5
Earliest	Feb 25 (2012)	Oct 26 (2013)
Latest	Apr 8 (2009)	Nov 26 (2009)
Trend	little change (less than half a day per decade)	6.6 days earlier per decade
Years with data	17	14

At 28°F (hard freeze) the median last spring date is Mar 7 and the median first fall date is Nov 16.

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
2021	Apr 3	no data	Feb 21	no data
2019	Mar 20	Nov 1	Mar 7	Nov 12
2018	Mar 22	no data	Mar 15	no data
2017	Mar 16	Oct 30	Mar 16	Nov 20
2016	Mar 22	Nov 20	Feb 27	Nov 21
2015	Mar 8	Nov 14	Mar 8	Nov 23
2014	Mar 26	Nov 2	Mar 26	Nov 2
2013	Mar 28	Oct 26	Mar 27	Nov 13
2012	Feb 25	Nov 9	Feb 13	Nov 25
2011	Mar 12	Oct 30	Feb 13	Nov 11
2010	Mar 8	Nov 6	Mar 7	Nov 7
2009	Apr 8	Nov 26	Mar 3	Nov 27
2008	Mar 25	Oct 28	Mar 25	Oct 29
2007	Apr 8	Nov 7	Mar 5	Nov 8
2006	Mar 26	Nov 4	Mar 26	Nov 21
2005	Mar 9	no data	Mar 2	no data
2004	Mar 23	Nov 26	Feb 28	Dec 14

"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.