Last Frost Day

Frost history / Minchumina, AK

Minchumina, AK: frost dates by year

Last spring and first fall frost at NOAA station USC00505881, 1951 to 2024, measured from daily minimum temperatures.

Elevation 1,025 ft, 63.903, -152.282. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianMay 20Sep 14
EarliestMay 2 (2021)Aug 22 (1986)
LatestJun 10 (1985)Sep 30 (2018)
Trend0.8 days earlier per decade0.8 days later per decade
Years with data4138

At 28°F (hard freeze) the median last spring date is May 8 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 2919601970198019902000201020201951: May 191952: Jun 11953: May 111954: May 241955: May 151956: May 221957: May 141958: May 111959: May 131960: Jun 21961: May 201962: May 291963: May 101964: May 231965: May 171967: May 171968: May 221976: May 271977: May 301982: May 281983: Jun 71984: May 311985: Jun 101986: May 271987: May 251988: May 171989: May 232010: May 172012: May 152013: May 212014: Jun 12015: May 62016: May 32017: May 262018: May 152019: May 122020: May 52021: May 22022: May 142023: Jun 12024: May 15

First fall frost (32°F)

Aug 13Aug 28Sep 12Sep 27Oct 1219601970198019902000201020201951: Sep 121952: Aug 231953: Sep 251954: Sep 181955: Aug 301956: Sep 191957: Sep 181958: Sep 231959: Sep 101960: Sep 171961: Sep 41962: Sep 41963: Sep 151964: Sep 151965: Aug 301966: Sep 91975: Sep 141982: Sep 41983: Sep 21984: Aug 241985: Sep 51986: Aug 221988: Sep 151989: Sep 162010: Sep 232011: Sep 52012: Sep 102014: Aug 302015: Aug 312016: Sep 142017: Sep 292018: Sep 302019: Sep 172020: Sep 282021: Aug 282022: Sep 262023: Sep 182024: Sep 21

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
2024May 15Sep 21Apr 30Oct 2
2023Jun 1Sep 18Apr 29Sep 28
2022May 14Sep 26May 11Oct 10
2021May 2Aug 28May 1Sep 18
2020May 5Sep 28May 1Oct 11
2019May 12Sep 17Apr 28Sep 22
2018May 15Sep 30May 7Oct 8
2017May 26Sep 29Apr 17Sep 30
2016May 3Sep 14Apr 20Sep 27
2015May 6Aug 31Apr 29Sep 24
2014Jun 1Aug 30Apr 16Sep 23
2013May 21no dataMay 20no data
2012May 15Sep 10May 13Sep 11
2011no dataSep 5no dataSep 30
2010May 17Sep 23May 6Sep 25
1989May 23Sep 16May 20Sep 28
1988May 17Sep 15May 5Sep 25
1987May 25no dataMay 8no data
1986May 27Aug 22May 22Sep 22
1985Jun 10Sep 5May 22Sep 11
1984May 31Aug 24May 13Aug 27
1983Jun 7Sep 2May 20Sep 2
1982May 28Sep 4May 16Sep 23
1977May 30no dataMay 21no data
1976May 27no dataMay 17no data
1975no dataSep 14no dataSep 24
1968May 22no dataMay 13no data
1967May 17no dataMay 7no data
1966no dataSep 9no dataOct 5
1965May 17Aug 30May 14Sep 29
1964May 23Sep 15May 23Sep 16
1963May 10Sep 15May 8Sep 26
1962May 29Sep 4May 17Sep 16
1961May 20Sep 4Apr 30Sep 30
1960Jun 2Sep 17Apr 27Sep 18
1959May 13Sep 10May 1Sep 26
1958May 11Sep 23May 10Sep 24
1957May 14Sep 18May 14Sep 19
1956May 22Sep 19Apr 21Sep 20
1955May 15Aug 30May 8Sep 25
1954May 24Sep 18May 2Sep 18
1953May 11Sep 25Apr 26Sep 28
1952Jun 1Aug 23May 21Sep 6
1951May 19Sep 12May 5Sep 28

"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.