Boston 4 Se, VA: frost dates by year

Last spring and first fall frost at NOAA station USC00440860, 1999 to 2015, measured from daily minimum temperatures.

Elevation 590 ft, 38.546, -78.098. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 17
Earliest	Apr 1 (2003)	Oct 3 (2003)
Latest	May 22 (2002)	Oct 29 (2011)
Trend	9.1 days earlier per decade	6.9 days later per decade
Years with data	15	12

At 28°F (hard freeze) the median last spring date is Apr 1 and the median first fall date is Oct 30.

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
2015	Apr 5	no data	Mar 30	no data
2013	Apr 23	Oct 24	Apr 5	Oct 25
2012	Apr 25	Oct 13	Mar 27	Nov 3
2011	no data	Oct 29	no data	Oct 31
2010	May 10	no data	Mar 28	no data
2009	Apr 17	no data	Apr 9	no data
2008	Apr 18	Oct 20	Apr 17	Oct 20
2007	Apr 11	no data	Apr 11	no data
2006	Apr 29	Oct 13	Mar 23	Oct 13
2005	May 4	Oct 27	Apr 16	Nov 11
2004	Apr 17	Oct 18	Mar 25	Nov 9
2003	Apr 1	Oct 3	Apr 1	Oct 5
2002	May 22	Oct 15	Apr 8	Nov 2
2001	Apr 29	Oct 8	Apr 19	Oct 9
2000	Apr 13	Oct 8	Mar 19	Oct 29
1999	May 16	Oct 25	Mar 31	Nov 4

"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.