Frost history / Catoctin Mtn Park, MD
Catoctin Mtn Park, MD: frost dates by year
Last spring and first fall frost at NOAA station USC00181530, 1968 to 2011, measured from daily minimum temperatures.
Elevation 1,610 ft, 39.645, -77.483. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 22 | Oct 25 |
| Earliest | Apr 8 (1994) | Sep 29 (2003) |
| Latest | May 13 (1996) | Nov 11 (1994) |
| Trend | 2.5 days earlier per decade | 0.7 days later per decade |
| Years with data | 41 | 39 |
At 28°F (hard freeze) the median last spring date is Apr 9 and the median first fall date is Nov 5.
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 |
|---|---|---|---|---|
| 2011 | no data | Oct 28 | no data | Oct 30 |
| 2010 | Apr 14 | no data | Mar 27 | no data |
| 2009 | Apr 14 | no data | Apr 14 | no data |
| 2008 | Apr 14 | no data | Apr 14 | no data |
| 2007 | no data | Nov 8 | no data | Nov 8 |
| 2006 | no data | Oct 13 | no data | Nov 3 |
| 2005 | Apr 24 | Oct 28 | Mar 22 | Nov 17 |
| 2004 | Apr 28 | Nov 9 | Apr 6 | Nov 10 |
| 2003 | Apr 24 | Sep 29 | Apr 8 | Sep 29 |
| 2002 | Apr 23 | Oct 23 | Apr 7 | Oct 23 |
| 2001 | Apr 19 | Oct 8 | Mar 28 | Nov 12 |
| 2000 | Apr 14 | Oct 29 | Apr 9 | Nov 16 |
| 1999 | Apr 24 | Nov 4 | Mar 26 | Nov 16 |
| 1998 | Apr 8 | Nov 4 | Apr 8 | Nov 5 |
| 1997 | Apr 19 | Oct 23 | Apr 10 | Oct 23 |
| 1996 | May 13 | Oct 4 | Apr 10 | Nov 3 |
| 1995 | Apr 15 | no data | Apr 15 | no data |
| 1994 | Apr 8 | Nov 11 | Apr 8 | Nov 11 |
| 1993 | Apr 27 | Nov 1 | Apr 6 | Nov 8 |
| 1992 | Apr 13 | Oct 20 | Apr 13 | Oct 20 |
| 1991 | Apr 22 | no data | Apr 3 | no data |
| 1990 | Apr 18 | Oct 27 | Apr 18 | Nov 9 |
| 1989 | Apr 23 | Oct 9 | Apr 13 | Nov 4 |
| 1988 | Apr 22 | Oct 13 | Mar 23 | Oct 31 |
| 1987 | Apr 29 | Oct 22 | Apr 1 | Nov 10 |
| 1986 | Apr 24 | Oct 31 | Apr 24 | Nov 13 |
| 1985 | Apr 10 | Oct 29 | Apr 10 | Oct 29 |
| 1984 | Apr 12 | Nov 3 | Apr 5 | Nov 3 |
| 1983 | May 10 | Oct 30 | Apr 20 | Nov 13 |
| 1982 | Apr 12 | Oct 23 | Apr 12 | Oct 23 |
| 1981 | Apr 21 | Oct 20 | Apr 21 | Nov 13 |
| 1980 | Apr 17 | Oct 26 | Apr 17 | Nov 11 |
| 1979 | Apr 10 | Oct 10 | Apr 7 | Oct 27 |
| 1978 | May 2 | Oct 25 | Apr 9 | Nov 26 |
| 1977 | May 10 | Oct 17 | Apr 9 | Nov 13 |
| 1976 | May 4 | Oct 18 | Apr 12 | Oct 18 |
| 1975 | Apr 22 | Oct 31 | Apr 14 | Oct 31 |
| 1974 | May 7 | Oct 3 | Apr 10 | Oct 3 |
| 1973 | Apr 14 | Nov 4 | Apr 14 | Nov 6 |
| 1972 | Apr 27 | Oct 10 | Apr 9 | Oct 20 |
| 1971 | Apr 27 | Nov 5 | Apr 15 | Nov 8 |
| 1970 | May 7 | Oct 17 | May 7 | Nov 17 |
| 1969 | Apr 12 | Oct 23 | Apr 1 | Oct 23 |
| 1968 | May 7 | Oct 30 | Apr 6 | Oct 31 |
"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 1991–2020 frost probabilities.