Bethlehem 2, NH: frost dates by year

Last spring and first fall frost at NOAA station USC00270706, 1992 to 2013, measured from daily minimum temperatures.

Elevation 1,180 ft, 44.306, -71.657. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 24	Sep 19
Earliest	May 3 (2007)	Sep 3 (2001)
Latest	Jun 13 (2004)	Oct 8 (2006)
Trend	3.5 days earlier per decade	3.5 days later per decade
Years with data	20	21

At 28°F (hard freeze) the median last spring date is May 14 and the median first fall date is Oct 4.

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
2013	May 28	no data	May 15	no data
2012	no data	Sep 17	no data	Oct 9
2011	May 9	Sep 17	May 1	Oct 6
2010	May 17	Sep 21	May 13	Oct 10
2009	Jun 1	Sep 20	May 26	Sep 26
2008	May 29	Sep 19	May 2	Sep 23
2007	May 3	Sep 17	Apr 12	Oct 17
2006	May 8	Oct 8	Apr 30	Oct 29
2005	May 20	Oct 2	May 14	Oct 21
2004	Jun 13	Sep 7	Jun 13	Sep 15
2003	May 18	Sep 17	May 4	Sep 17
2002	Jun 4	Sep 29	May 21	Oct 9
2001	Jun 1	Sep 3	May 7	Sep 3
2000	May 21	Sep 5	May 20	Sep 29
1999	May 15	Sep 19	May 13	Oct 8
1998	May 13	Sep 24	Apr 29	Oct 4
1997	May 28	Sep 22	May 27	Oct 8
1996	May 31	Sep 24	May 26	Oct 4
1995	May 10	Sep 11	May 8	Sep 19
1994	May 29	Sep 4	May 28	Oct 12
1993	Jun 5	Sep 20	May 14	Sep 20
1992	no data	Sep 13	no data	Sep 24

"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.