Last Frost Day

Frost history / Big Falls, MN

Big Falls, MN: frost dates by year

Last spring and first fall frost at NOAA station USC00210746, 1951 to 2025, measured from daily minimum temperatures.

Elevation 1,220 ft, 48.197, -93.799. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianMay 29Sep 17
EarliestApr 28 (2024)Aug 13 (1964)
LatestJul 4 (1972)Oct 15 (2021)
Trend1.6 days earlier per decade2.0 days later per decade
Years with data4333

At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Sep 25.

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 1419601970198019902000201020201951: Jun 101952: Jun 11953: Jun 71954: Jun 51955: May 171956: Jun 11957: Jun 121958: Jun 201959: May 221960: May 121961: May 291964: Jun 41965: May 291966: May 301968: May 231969: Jun 201970: May 261971: Jun 11972: Jul 41973: May 171974: May 151975: May 121976: May 241977: May 81979: Jun 11980: Jun 101981: May 181986: Jun 51987: May 231988: May 241989: Jun 92008: May 282009: Jun 62010: May 142011: May 262012: May 312013: Jun 32017: May 192019: Jun 12020: May 102021: May 292024: Apr 282025: May 23

First fall frost (32°F)

Jul 29Aug 13Aug 28Sep 12Sep 27Oct 12Oct 2719601970198019902000201020201951: Sep 241952: Sep 161953: Sep 221954: Sep 221955: Sep 101956: Sep 71957: Sep 201958: Sep 271959: Sep 151960: Sep 181961: Sep 231963: Sep 131964: Aug 131966: Sep 151967: Sep 91970: Sep 131971: Sep 191974: Sep 31979: Aug 151980: Sep 171981: Sep 42007: Sep 122008: Oct 32009: Sep 302011: Sep 142012: Sep 132018: Sep 52019: Oct 22020: Sep 272021: Oct 152022: Sep 262023: Oct 52025: Oct 7

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 23Oct 7Apr 29Oct 7
2024Apr 28no dataApr 23no data
2023no dataOct 5no dataOct 15
2022no dataSep 26no dataSep 27
2021May 29Oct 15May 28Oct 20
2020May 10Sep 27May 10Sep 27
2019Jun 1Oct 2May 6Oct 19
2018no dataSep 5no dataSep 28
2017May 19no dataMay 19no data
2013Jun 3no dataMay 12no data
2012May 31Sep 13Apr 26Sep 18
2011May 26Sep 14May 2Sep 15
2010May 14no dataMay 9no data
2009Jun 6Sep 30May 16Oct 8
2008May 28Oct 3May 27Oct 3
2007no dataSep 12no dataOct 27
1989Jun 9no dataMay 7no data
1988May 24no dataMay 13no data
1987May 23no dataMay 3no data
1986Jun 5no dataMay 3no data
1981May 18Sep 4May 18Sep 20
1980Jun 10Sep 17May 15Sep 23
1979Jun 1Aug 15May 21Oct 7
1977May 8no dataMay 7no data
1976May 24no dataMay 11no data
1975May 12no dataApr 25no data
1974May 15Sep 3May 13Sep 3
1973May 17no dataMay 17no data
1972Jul 4no dataMay 9no data
1971Jun 1Sep 19May 21Sep 22
1970May 26Sep 13May 2Sep 28
1969Jun 20no dataMay 21no data
1968May 23no dataMay 21no data
1967no dataSep 9no dataSep 23
1966May 30Sep 15May 10Sep 25
1965May 29no dataApr 28no data
1964Jun 4Aug 13Jun 4Sep 15
1963no dataSep 13no dataSep 29
1961May 29Sep 23May 17Sep 23
1960May 12Sep 18May 11Sep 30
1959May 22Sep 15May 15Sep 16
1958Jun 20Sep 27May 28Oct 1
1957Jun 12Sep 20May 9Sep 20
1956Jun 1Sep 7May 24Sep 7
1955May 17Sep 10May 17Sep 11
1954Jun 5Sep 22May 26Sep 22
1953Jun 7Sep 22May 20Sep 22
1952Jun 1Sep 16Jun 1Oct 3
1951Jun 10Sep 24May 10Sep 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.