Mattituck, NY: frost dates by year

Last spring and first fall frost at NOAA station USC00305142, 2010 to 2022, measured from daily minimum temperatures.

Elevation 20 ft, 40.989, -72.510. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 10	Nov 2
Earliest	Mar 28 (2010)	Oct 14 (2010)
Latest	Apr 23 (2020)	Nov 15 (2014)
Trend	10.8 days later per decade	11.9 days later per decade
Years with data	11	10

At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 12.

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	Apr 21	no data	Mar 30	no data
2021	Apr 5	Nov 6	Apr 5	Nov 20
2020	Apr 23	Oct 30	Apr 12	Oct 31
2019	Apr 11	Nov 8	Apr 11	Nov 8
2018	no data	Oct 31	no data	Nov 12
2017	Apr 9	Nov 10	Mar 25	Nov 10
2016	Apr 14	no data	Apr 9	no data
2015	Apr 6	Oct 19	Apr 2	Nov 24
2014	Apr 21	Nov 15	Mar 27	Nov 15
2013	no data	Nov 4	no data	Nov 13
2012	Apr 3	no data	Apr 3	no data
2011	Apr 10	Oct 27	Mar 28	Oct 27
2010	Mar 28	Oct 14	Mar 27	Nov 28

"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.