Hampton, CT: frost dates by year

Last spring and first fall frost at NOAA station USC00063420, 2007 to 2025, measured from daily minimum temperatures.

Elevation 490 ft, 41.767, -72.053. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 26	Oct 17
Earliest	Apr 12 (2019)	Oct 9 (2022)
Latest	May 22 (2020)	Nov 3 (2021)
Trend	1.8 days earlier per decade	1.2 days later per decade
Years with data	18	19

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 31.

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
2025	Apr 19	Oct 10	Apr 11	Nov 2
2024	Apr 28	Oct 11	Mar 25	Nov 4
2023	May 19	Nov 2	Apr 11	Nov 2
2022	Apr 22	Oct 9	Apr 19	Nov 15
2021	Apr 23	Nov 3	Apr 23	Nov 4
2020	May 22	Oct 18	Apr 25	Oct 31
2019	Apr 12	Oct 19	Apr 5	Nov 2
2018	Apr 25	Oct 17	Apr 12	Oct 19
2017	Apr 16	Nov 1	Mar 31	Nov 9
2016	May 10	Oct 11	Apr 13	Oct 27
2015	Apr 26	Oct 17	Apr 25	Oct 18
2014	Apr 22	Oct 20	Apr 21	Oct 20
2013	May 15	Oct 21	Apr 8	Oct 26
2012	May 1	Oct 13	Mar 28	Oct 13
2011	Apr 23	Oct 28	Apr 9	Oct 31
2010	May 11	Oct 10	Mar 29	Nov 1
2009	Apr 18	Oct 12	Apr 13	Nov 7
2008	no data	Oct 21	no data	Oct 24
2007	May 7	Oct 15	Apr 12	Oct 29

"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.