Ashburnham N, MA: frost dates by year

Last spring and first fall frost at NOAA station USC00190192, 2008 to 2025, measured from daily minimum temperatures.

Elevation 1,146 ft, 42.662, -71.936. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 2	Oct 8
Earliest	Apr 22 (2025)	Sep 6 (2013)
Latest	May 19 (2009)	Oct 24 (2023)
Trend	3.4 days earlier per decade	4.3 days later per decade
Years with data	17	16

At 28°F (hard freeze) the median last spring date is Apr 29 and the median first fall date is Oct 19.

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	no data	Apr 21	no data
2024	Apr 27	Oct 13	Apr 26	Oct 13
2023	May 18	Oct 24	May 18	Oct 31
2022	May 8	Oct 9	May 8	Oct 19
2021	Apr 23	Oct 24	Apr 23	Nov 3
2020	May 14	Sep 20	May 14	Oct 9
2019	May 9	Sep 19	Apr 29	Oct 5
2018	Apr 30	Oct 14	Apr 23	Oct 19
2016	Apr 29	Sep 26	Apr 28	Oct 15
2015	May 2	Sep 27	May 2	Oct 18
2014	May 8	Oct 6	Apr 20	Oct 21
2013	May 16	Sep 6	May 5	Oct 26
2012	Apr 30	Oct 13	Apr 29	Oct 13
2011	Apr 23	Oct 6	Apr 23	Oct 28
2010	May 13	Oct 13	May 11	Oct 19
2009	May 19	Oct 11	Apr 17	Oct 12
2008	May 1	Oct 7	May 1	Oct 18

"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.