Last Frost Day

Frost history / Carson Fish Hatchery, WA

Carson Fish Hatchery, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00451160, 1978 to 2025, measured from daily minimum temperatures.

Elevation 1,134 ft, 45.868, -121.973. Download the data (JSON) · NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianMay 10Oct 4
EarliestApr 20 (1993)Aug 3 (1985)
LatestJun 25 (1985)Nov 6 (2022)
Trend4.8 days earlier per decade5.3 days later per decade
Years with data3839

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 27.

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)

Apr 15Apr 30May 15May 30Jun 14Jun 29Jul 14198019902000201020201978: May 301979: Jun 151980: May 171981: May 131983: Jun 51984: Jun 11985: Jun 251986: May 171987: May 201989: May 131990: May 91991: Jun 51992: May 211993: Apr 201994: May 11995: Apr 231996: May 91997: May 31998: Apr 261999: May 102000: May 72001: May 72002: May 112003: May 192004: Apr 252008: May 92009: May 102010: May 92011: May 182013: May 232015: May 82018: Apr 232019: May 22021: May 202022: May 192023: Apr 302024: May 22025: May 4

First fall frost (32°F)

Jul 29Aug 13Aug 28Sep 12Sep 27Oct 12Oct 27Nov 11198019902000201020201978: Sep 181979: Nov 11980: Aug 71981: Oct 111982: Sep 291984: Sep 241985: Aug 31986: Oct 21987: Oct 101988: Sep 181989: Oct 151990: Oct 61991: Oct 281992: Sep 71993: Sep 211994: Oct 31995: Oct 191996: Sep 231997: Oct 201998: Oct 161999: Sep 272000: Sep 232001: Oct 182002: Oct 22003: Oct 302004: Oct 252005: Sep 242006: Oct 102008: Sep 242010: Oct 132012: Oct 42015: Sep 292017: Oct 42018: Oct 142019: Oct 12020: Oct 222022: Nov 62023: Oct 172025: Oct 13

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
2025May 4Oct 13Mar 6Oct 14
2024May 2no dataApr 18no data
2023Apr 30Oct 17Apr 14Oct 27
2022May 19Nov 6Apr 6Nov 9
2021May 20no dataApr 13no data
2020no dataOct 22no dataOct 23
2019May 2Oct 1Apr 29Oct 10
2018Apr 23Oct 14Apr 4Nov 9
2017no dataOct 4no dataOct 31
2015May 8Sep 29Mar 6Nov 22
2013May 23no dataMay 2no data
2012no dataOct 4no dataOct 6
2011May 18no dataMay 2no data
2010May 9Oct 13Apr 10Nov 23
2009May 10no dataApr 25no data
2008May 9Sep 24Apr 3Nov 24
2006no dataOct 10no dataOct 10
2005no dataSep 24no dataNov 9
2004Apr 25Oct 25Apr 1Nov 4
2003May 19Oct 30Mar 2Oct 31
2002May 11Oct 2Apr 24Oct 12
2001May 7Oct 18Apr 15Nov 7
2000May 7Sep 23Apr 6Sep 23
1999May 10Sep 27May 10Oct 16
1998Apr 26Oct 16Mar 30Oct 30
1997May 3Oct 20Apr 13Nov 12
1996May 9Sep 23Mar 29Oct 26
1995Apr 23Oct 19Mar 30Oct 30
1994May 1Oct 3Mar 26Nov 3
1993Apr 20Sep 21Mar 28Nov 1
1992May 21Sep 7Apr 23Oct 15
1991Jun 5Oct 28Apr 12Oct 30
1990May 9Oct 6Mar 27Oct 7
1989May 13Oct 15Mar 23Oct 15
1988no dataSep 18no dataOct 27
1987May 20Oct 10Mar 30Oct 12
1986May 17Oct 2May 1Nov 10
1985Jun 25Aug 3May 13Sep 29
1984Jun 1Sep 24Apr 26Sep 29
1983Jun 5no dataMay 2no data
1982no dataSep 29no dataOct 19
1981May 13Oct 11Apr 14Oct 12
1980May 17Aug 7Apr 30Oct 16
1979Jun 15Nov 1Mar 24Nov 1
1978May 30Sep 18May 5Oct 25

"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.