Ashburnham, MA: frost dates by year

Last spring and first fall frost at NOAA station USC00190190, 2008 to 2025, measured from daily minimum temperatures.

Elevation 1,108 ft, 42.618, -71.916. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 18
Earliest	Apr 15 (2009)	Oct 5 (2019)
Latest	May 19 (2023)	Oct 31 (2023)
Trend	3.1 days later per decade	little change (less than half a day per decade)
Years with data	18	18

At 28°F (hard freeze) the median last spring date is Apr 13 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 22	Oct 10	Apr 19	Nov 2
2024	Apr 27	Oct 17	Apr 26	Oct 27
2023	May 19	Oct 31	Apr 10	Nov 2
2022	May 1	Oct 20	Mar 31	Nov 9
2021	Apr 24	Oct 29	Apr 23	Nov 4
2020	May 14	Oct 9	Apr 24	Oct 31
2019	Apr 30	Oct 5	Apr 12	Nov 2
2018	Apr 24	Oct 18	Apr 16	Oct 22
2017	May 10	Oct 17	Mar 31	Nov 9
2016	Apr 29	Oct 25	Apr 11	Oct 27
2015	Apr 26	Oct 18	Apr 10	Oct 18
2014	Apr 28	Oct 20	Apr 19	Nov 3
2013	Apr 23	Oct 23	Apr 7	Oct 29
2012	May 1	Oct 13	Apr 7	Oct 13
2011	Apr 23	Oct 28	Apr 23	Oct 28
2010	May 12	Oct 13	Mar 29	Nov 1
2009	Apr 15	Oct 12	Apr 14	Oct 15
2008	May 1	Oct 20	Apr 16	Oct 30

"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.