Last Frost Day

Frost history / Octoraro Lake, PA

Octoraro Lake, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00366508, 1978 to 2025, measured from daily minimum temperatures.

Elevation 260 ft, 39.796, -76.044. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianApr 26Oct 19
EarliestMar 28 (2010)Sep 18 (1990)
LatestMay 30 (1996)Nov 26 (1978)
Trend2.6 days earlier per decade2.3 days later per decade
Years with data4444

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 31.

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)

Mar 16Mar 31Apr 15Apr 30May 15May 30Jun 14198019902000201020201979: Apr 181981: Apr 221982: Apr 291983: May 111984: May 171985: May 41986: May 41987: Apr 141988: Apr 271989: Apr 211990: Apr 191991: Apr 231992: May 71993: Apr 281995: May 91996: May 301997: May 81998: Apr 291999: May 162000: May 162001: May 152002: May 212003: Apr 142004: Apr 162005: May 32006: Apr 112007: Apr 142008: Apr 162009: Apr 242010: Mar 282011: Apr 62012: Apr 282013: May 142014: Apr 252015: Apr 252016: Apr 172017: Apr 92018: May 12019: Apr 32020: May 122022: Apr 302023: Apr 262024: Apr 232025: Apr 18

First fall frost (32°F)

Sep 12Sep 27Oct 12Oct 27Nov 11Nov 26Dec 11198019902000201020201978: Nov 261979: Oct 141980: Oct 141981: Oct 91983: Oct 221984: Nov 31985: Oct 261987: Oct 81988: Oct 141989: Oct 81990: Sep 181991: Oct 81992: Oct 11993: Oct 111994: Oct 111995: Oct 171996: Oct 41997: Oct 21998: Oct 21999: Oct 62000: Oct 82001: Oct 82002: Oct 222004: Oct 182005: Oct 292006: Oct 132007: Oct 292008: Oct 202009: Oct 202010: Oct 232011: Oct 302012: Oct 132013: Oct 242014: Oct 202015: Oct 192016: Oct 262017: Nov 102018: Oct 192019: Oct 192020: Oct 312022: Oct 202023: Oct 242024: Oct 272025: Oct 25

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

YearLast spring 32°FFirst fall 32°FLast spring 28°FFirst fall 28°F
2025Apr 18Oct 25Apr 9Nov 7
2024Apr 23Oct 27Mar 25Oct 28
2023Apr 26Oct 24Apr 10Nov 25
2022Apr 30Oct 20Apr 29Nov 14
2020May 12Oct 31Apr 19Nov 17
2019Apr 3Oct 19Apr 2Nov 4
2018May 1Oct 19Apr 20Nov 10
2017Apr 9Nov 10Mar 24Nov 10
2016Apr 17Oct 26Apr 10Oct 26
2015Apr 25Oct 19Apr 25Oct 19
2014Apr 25Oct 20Apr 16Nov 8
2013May 14Oct 24Apr 4Oct 25
2012Apr 28Oct 13Apr 8Nov 5
2011Apr 6Oct 30Mar 30Nov 6
2010Mar 28Oct 23Mar 27Nov 2
2009Apr 24Oct 20Apr 13Nov 6
2008Apr 16Oct 20Apr 3Oct 31
2007Apr 14Oct 29Apr 14Nov 8
2006Apr 11Oct 13Mar 27Oct 30
2005May 3Oct 29Mar 22Nov 12
2004Apr 16Oct 18Mar 24Nov 9
2003Apr 14no dataApr 1no data
2002May 21Oct 22May 18Nov 2
2001May 15Oct 8Apr 19Oct 8
2000May 16Oct 8Apr 26Oct 9
1999May 16Oct 6Apr 30Oct 6
1998Apr 29Oct 2Apr 29Oct 2
1997May 8Oct 2May 8Oct 20
1996May 30Oct 4May 14Oct 4
1995May 9Oct 17Apr 17Oct 17
1994no dataOct 11no dataNov 8
1993Apr 28Oct 11Apr 28Oct 11
1992May 7Oct 1May 7Oct 7
1991Apr 23Oct 8Apr 3Oct 8
1990Apr 19Sep 18Apr 19Oct 30
1989Apr 21Oct 8Mar 23Nov 4
1988Apr 27Oct 14Apr 22Oct 20
1987Apr 14Oct 8Apr 2Oct 13
1986May 4no dataApr 14no data
1985May 4Oct 26Apr 11Oct 29
1984May 17Nov 3Apr 26Nov 3
1983May 11Oct 22Apr 21Oct 22
1982Apr 29no dataApr 29no data
1981Apr 22Oct 9Apr 22Nov 8
1980no dataOct 14no dataOct 23
1979Apr 18Oct 14Apr 9Oct 26
1978no dataNov 26no dataNov 29

"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.