Hyder, AK: frost dates by year

Last spring and first fall frost at NOAA station USC00503821, 2004 to 2022, measured from daily minimum temperatures.

Elevation 80 ft, 55.916, -130.026. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 5	Oct 17
Earliest	Apr 30 (2018)	Oct 2 (2006)
Latest	May 22 (2007)	Oct 27 (2022)
Trend	5.0 days earlier per decade	0.5 days earlier per decade
Years with data	10	11

At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 29.

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
2022	no data	Oct 27	no data	Nov 2
2021	May 18	Oct 5	Apr 27	Dec 4
2020	Apr 30	Oct 19	Apr 15	Oct 24
2019	Apr 30	Oct 9	Apr 3	Oct 9
2018	Apr 30	Oct 2	Apr 16	Oct 4
2017	May 4	no data	Mar 22	no data
2012	May 15	Oct 19	Apr 22	Oct 27
2011	May 1	no data	Apr 28	no data
2010	no data	Oct 27	no data	Nov 10
2007	May 22	Oct 17	May 8	Nov 2
2006	May 14	Oct 2	Apr 16	Oct 29
2005	no data	Oct 15	no data	Nov 27
2004	May 6	Oct 17	Mar 27	Oct 21

"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.