Last Frost Day

Frost history / Larimore 4SW, ND

Larimore 4SW, ND: frost dates by year

Last spring and first fall frost at NOAA station USC00325013, 1951 to 2006, measured from daily minimum temperatures.

Elevation 1,152 ft, 47.874, -97.711. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianMay 17Sep 23
EarliestApr 21 (1987)Aug 13 (1964)
LatestJun 9 (1966)Oct 11 (1963)
Trend3.3 days earlier per decade1.2 days later per decade
Years with data4133

At 28°F (hard freeze) the median last spring date is May 7 and the median first fall date is Oct 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)

Apr 15Apr 30May 15May 30Jun 14196019701980199020001952: May 291953: Jun 61954: May 251955: May 81956: May 191957: May 271958: May 221959: May 221960: May 111961: May 291962: May 61963: May 221964: Jun 41965: May 281966: Jun 91967: May 211968: May 231969: May 201970: May 261972: May 71974: May 71975: May 151977: May 81981: May 111987: Apr 211988: May 161989: May 71990: May 181991: May 51992: May 51993: May 261994: May 71995: May 171996: May 121998: Apr 211999: May 82000: May 142001: Apr 242002: May 252004: May 152006: May 21

First fall frost (32°F)

Jul 29Aug 13Aug 28Sep 12Sep 27Oct 12Oct 27196019701980199020001951: Sep 231952: Sep 231953: Sep 221954: Sep 221955: Sep 111956: Sep 81957: Sep 231958: Sep 301959: Sep 101960: Sep 301961: Sep 231962: Sep 201963: Oct 111964: Aug 131965: Sep 241966: Oct 11967: Sep 271968: Oct 31969: Sep 301971: Sep 181972: Sep 251973: Sep 161987: Oct 21988: Oct 41989: Sep 231990: Sep 231991: Sep 191992: Sep 221995: Sep 191997: Oct 101999: Sep 202000: Sep 232001: Sep 24

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
2006May 21no dataMay 5no data
2004May 15no dataMay 15no data
2002May 25no dataMay 24no data
2001Apr 24Sep 24Apr 23Oct 5
2000May 14Sep 23Apr 21Oct 4
1999May 8Sep 20Apr 18Oct 2
1998Apr 21no dataApr 18no data
1997no dataOct 10no dataOct 21
1996May 12no dataMay 11no data
1995May 17Sep 19Apr 26Sep 21
1994May 7no dataMay 7no data
1993May 26no dataMay 2no data
1992May 5Sep 22May 3Sep 22
1991May 5Sep 19Apr 24Oct 15
1990May 18Sep 23May 10Sep 30
1989May 7Sep 23May 7Sep 23
1988May 16Oct 4May 13Oct 4
1987Apr 21Oct 2Apr 3Oct 2
1981May 11no dataMay 10no data
1977May 8no dataApr 8no data
1975May 15no dataApr 20no data
1974May 7no dataApr 23no data
1973no dataSep 16no dataSep 20
1972May 7Sep 25Apr 9Sep 27
1971no dataSep 18no dataOct 28
1970May 26no dataMay 5no data
1969May 20Sep 30May 20Oct 20
1968May 23Oct 3May 9Oct 4
1967May 21Sep 27May 12Sep 27
1966Jun 9Oct 1May 10Oct 12
1965May 28Sep 24May 19Sep 24
1964Jun 4Aug 13Jun 1Sep 11
1963May 22Oct 11May 22Oct 29
1962May 6Sep 20May 6Sep 20
1961May 29Sep 23May 16Sep 28
1960May 11Sep 30May 8Oct 11
1959May 22Sep 10May 15Sep 16
1958May 22Sep 30May 4Oct 5
1957May 27Sep 23May 9Sep 23
1956May 19Sep 8May 1Sep 14
1955May 8Sep 11May 8Sep 11
1954May 25Sep 22May 8Oct 2
1953Jun 6Sep 22May 16Oct 6
1952May 29Sep 23Apr 14Oct 2
1951no dataSep 23no dataSep 24

"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.