Lewistown, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00364992, 1951 to 2025, measured from daily minimum temperatures.

Elevation 460 ft, 40.586, -77.569. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 19
Earliest	Mar 28 (2010)	Sep 11 (1995)
Latest	May 25 (1963)	Nov 18 (1970)
Trend	0.9 days earlier per decade	1.9 days later per decade
Years with data	69	68

At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Nov 2.

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 18	Oct 26	Apr 10	Nov 15
2024	Apr 23	Oct 28	Mar 25	Nov 13
2023	Apr 26	Nov 1	Mar 31	Nov 2
2022	May 1	Oct 21	Apr 18	Nov 15
2021	Apr 23	Sep 26	Apr 4	Nov 4
2020	May 10	Sep 19	May 9	Nov 19
2019	Apr 4	Nov 2	Apr 4	Nov 2
2018	Apr 22	Nov 4	Apr 11	Nov 11
2017	Apr 10	Nov 5	Mar 24	Nov 11
2016	Apr 15	Oct 26	Apr 11	Nov 12
2015	Apr 13	Oct 19	Apr 3	Oct 19
2014	Apr 18	Nov 8	Apr 17	Nov 16
2013	May 14	Oct 26	Apr 5	Oct 27
2012	Apr 29	Oct 13	Mar 12	Nov 16
2011	Apr 7	Oct 28	Mar 31	Oct 31
2010	Mar 28	Nov 1	Mar 28	Nov 2
2009	Apr 17	Oct 16	Apr 13	Oct 20
2008	no data	Oct 19	no data	Oct 31
2007	Apr 15	Oct 29	Apr 12	Nov 3
2006	Apr 26	Oct 13	Apr 10	Nov 4
2005	May 6	Oct 31	Mar 17	Nov 12
2004	Apr 17	Nov 9	Apr 6	Nov 10
2003	Apr 9	Oct 25	Apr 2	Nov 9
2002	May 21	Oct 22	Apr 8	Nov 8
2001	Apr 30	Oct 8	Apr 20	Oct 9
2000	Apr 14	no data	Apr 14	no data
1999	Apr 26	Oct 28	Mar 27	Nov 5
1998	Apr 11	Oct 30	Mar 27	Nov 3
1997	Apr 21	Oct 23	Apr 15	Oct 23
1996	no data	Oct 12	no data	Nov 4
1995	Apr 27	Sep 11	Apr 27	Sep 11
1994	Apr 22	Oct 11	Apr 7	Nov 11
1993	Apr 26	Sep 30	Mar 20	Oct 10
1992	Apr 13	no data	Apr 3	no data
1991	Apr 3	Oct 13	Apr 2	Oct 20
1990	Apr 19	Oct 26	Apr 13	Nov 8
1989	Apr 23	Nov 3	Apr 13	Nov 3
1988	Apr 25	Oct 7	Apr 18	Oct 26
1987	Apr 1	Oct 8	Mar 31	Oct 25
1986	Apr 23	Oct 10	Mar 24	Nov 2
1985	May 4	Oct 28	May 3	Oct 28
1984	May 16	Oct 1	Apr 1	Nov 2
1983	May 8	Sep 22	May 8	Oct 29
1981	May 18	Oct 3	May 3	Oct 10
1979	May 2	no data	Apr 8	no data
1978	May 1	Oct 17	Apr 9	Oct 18
1977	Apr 30	Oct 18	Apr 10	Nov 14
1976	May 9	Oct 19	Apr 12	Oct 19
1975	Apr 22	no data	Apr 22	no data
1974	May 8	Sep 24	May 8	Oct 3
1973	Apr 15	Oct 19	Apr 15	Nov 8
1971	Apr 12	Oct 13	Apr 12	Nov 5
1970	no data	Nov 18	no data	Nov 18
1969	Apr 8	Oct 23	Apr 2	Oct 24
1968	May 8	Oct 31	Apr 9	Oct 31
1967	Apr 30	Oct 21	Apr 13	Oct 29
1966	May 12	Oct 21	Mar 30	Oct 31
1965	Apr 6	Oct 6	Apr 6	Oct 29
1964	Apr 17	Oct 7	Apr 6	Oct 12
1963	May 25	Sep 24	Apr 11	Nov 5
1962	May 11	Oct 25	Apr 5	Oct 29
1961	Apr 21	Oct 28	Apr 21	Nov 11
1960	May 3	Oct 26	Apr 12	Nov 8
1959	Apr 25	Oct 19	Apr 15	Oct 29
1958	Apr 10	Oct 2	Apr 10	Nov 8
1957	May 5	Sep 27	Apr 12	Nov 8
1956	May 18	Sep 22	Apr 26	Nov 11
1955	Apr 9	Oct 23	Apr 6	Nov 6
1954	Apr 10	Oct 8	Apr 5	Nov 1
1953	Apr 23	Oct 8	Apr 22	Oct 8
1952	Apr 10	Oct 4	Apr 10	Oct 21
1951	Apr 24	Oct 10	Mar 28	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.