Sitka 1 Ne, AK: frost dates by year

Last spring and first fall frost at NOAA station USW00025379, 2005 to 2024, measured from daily minimum temperatures.

Elevation 78 ft, 57.057, -135.327. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 5	Oct 17
Earliest	Apr 9 (2012)	Sep 25 (2011)
Latest	May 21 (2013)	Nov 10 (2014)
Trend	10.6 days earlier per decade	little change (less than half a day per decade)
Years with data	19	20

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Nov 12.

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	Apr 17	Oct 19	Apr 3	Oct 21
2023	May 5	Oct 21	Apr 18	Oct 22
2022	May 8	Oct 25	Apr 16	Nov 5
2021	May 17	Oct 4	Mar 20	Nov 19
2020	Apr 12	Oct 17	Apr 11	Oct 21
2019	Apr 30	Oct 7	Mar 8	Oct 8
2018	Apr 21	Oct 3	Apr 4	Dec 1
2017	May 10	Oct 12	Mar 18	Nov 5
2016	Apr 20	Oct 9	Mar 10	Nov 17
2015	May 4	Oct 26	Mar 14	Nov 23
2014	Apr 25	Nov 10	Apr 12	Nov 12
2013	May 21	Nov 2	Apr 29	Nov 16
2012	Apr 9	Oct 18	Apr 8	Oct 21
2011	May 14	Sep 25	Apr 5	Nov 2
2010	May 3	Oct 21	Apr 12	Nov 17
2009	May 19	Sep 29	Apr 23	Nov 19
2008	May 19	Oct 7	Apr 20	Nov 16
2007	May 18	Oct 19	Apr 4	Nov 29
2006	May 16	Oct 27	Mar 31	Oct 28
2005	no data	Oct 15	no data	Nov 12

"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.