W Hampstead, NH: frost dates by year

Last spring and first fall frost at NOAA station USC00279278, 2007 to 2025, measured from daily minimum temperatures.

Elevation 288 ft, 42.911, -71.202. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 18
Earliest	Apr 18 (2019)	Sep 21 (2020)
Latest	May 18 (2023)	Nov 1 (2017)
Trend	little change (less than half a day per decade)	2.9 days earlier per decade
Years with data	18	19

At 28°F (hard freeze) the median last spring date is Apr 11 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 18	Oct 10	Apr 11	Oct 10
2024	Apr 27	Oct 17	Apr 26	Oct 29
2023	May 18	Oct 31	Apr 10	Nov 12
2022	May 9	Oct 20	Apr 3	Oct 29
2021	Apr 23	Oct 29	Apr 5	Nov 6
2020	May 13	Sep 21	Apr 17	Oct 31
2019	Apr 18	Oct 6	Apr 11	Nov 8
2018	Apr 24	Oct 18	Apr 16	Oct 19
2017	May 9	Nov 1	Apr 3	Nov 9
2016	Apr 30	Oct 15	Apr 15	Oct 27
2015	Apr 25	Oct 18	Apr 9	Oct 18
2014	Apr 22	Oct 20	Apr 20	Nov 10
2013	May 15	Oct 23	Apr 8	Oct 29
2012	Apr 30	Oct 13	Apr 2	Nov 6
2011	Apr 22	Oct 28	Apr 16	Oct 31
2010	May 11	Oct 19	Mar 28	Nov 1
2009	Apr 21	Oct 12	Apr 20	Oct 15
2008	May 2	Oct 18	May 1	Oct 20
2007	no data	Oct 29	no data	Nov 8

"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.