Last Frost Day

Frost history / Chino Valley, AZ

Chino Valley, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00021654, 1951 to 2018, measured from daily minimum temperatures.

Elevation 4,750 ft, 34.757, -112.457. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianMay 11Oct 15
EarliestApr 3 (2016)Sep 20 (1955)
LatestJun 20 (1962)Nov 21 (2007)
Trend4.7 days earlier per decade3.1 days later per decade
Years with data4137

At 28°F (hard freeze) the median last spring date is Apr 27 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 14Jun 291960197019801990200020101951: Jun 21952: May 181953: Jun 21954: Jun 111955: Jun 21956: Apr 301957: May 221958: May 21959: May 51960: May 251961: May 241962: Jun 201963: May 121964: May 91965: May 251966: Apr 221967: May 61969: Apr 291971: May 191972: May 231973: May 31974: May 201975: May 221976: Apr 271977: May 191978: May 111979: May 111980: May 311981: Apr 62005: May 112007: Apr 192008: May 142009: Apr 252010: May 122012: Apr 162013: Jun 12014: Apr 162015: Apr 182016: Apr 32017: Apr 112018: Apr 17

First fall frost (32°F)

Sep 12Sep 27Oct 12Oct 27Nov 11Nov 261960197019801990200020101951: Oct 61953: Oct 71954: Oct 151955: Sep 201956: Oct 91958: Oct 211959: Sep 251960: Oct 121962: Nov 71963: Oct 131964: Oct 301965: Sep 211966: Oct 141967: Oct 161968: Oct 171969: Oct 51970: Oct 81971: Oct 181972: Oct 261973: Oct 101974: Oct 301975: Oct 131976: Oct 81977: Nov 11978: Oct 271980: Oct 162005: Nov 52007: Nov 212008: Oct 122011: Oct 72012: Oct 252013: Oct 72014: Nov 42015: Nov 52016: Nov 112017: Oct 102018: Nov 9

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
2018Apr 17Nov 9Mar 26Nov 9
2017Apr 11Oct 10Mar 7Nov 19
2016Apr 3Nov 11Mar 31Nov 18
2015Apr 18Nov 5Apr 9Nov 7
2014Apr 16Nov 4Apr 3Nov 4
2013Jun 1Oct 7May 30Oct 31
2012Apr 16Oct 25Apr 7Oct 27
2011no dataOct 7no dataNov 2
2010May 12no dataApr 30no data
2009Apr 25no dataApr 15no data
2008May 14Oct 12Mar 23Oct 12
2007Apr 19Nov 21Apr 19Nov 22
2005May 11Nov 5Apr 11Nov 15
1981Apr 6no dataApr 4no data
1980May 31Oct 16May 25Oct 17
1979May 11no dataMay 9no data
1978May 11Oct 27May 6Nov 15
1977May 19Nov 1May 18Nov 8
1976Apr 27Oct 8Apr 27Oct 29
1975May 22Oct 13May 7Oct 24
1974May 20Oct 30May 20Nov 5
1973May 3Oct 10Apr 21Oct 11
1972May 23Oct 26Apr 21Oct 31
1971May 19Oct 18Apr 28Oct 19
1970no dataOct 8no dataOct 23
1969Apr 29Oct 5Apr 8Oct 5
1968no dataOct 17no dataNov 5
1967May 6Oct 16May 2Oct 29
1966Apr 22Oct 14Apr 20Oct 14
1965May 25Sep 21May 9Nov 11
1964May 9Oct 30May 9Nov 4
1963May 12Oct 13Apr 27Nov 17
1962Jun 20Nov 7May 13Nov 7
1961May 24no dataApr 27no data
1960May 25Oct 12May 25Oct 31
1959May 5Sep 25May 5Oct 4
1958May 2Oct 21Apr 27Oct 22
1957May 22no dataApr 28no data
1956Apr 30Oct 9Apr 19Oct 25
1955Jun 2Sep 20May 16Oct 7
1954Jun 11Oct 15Apr 7Oct 25
1953Jun 2Oct 7May 30Oct 12
1952May 18no dataMay 18no data
1951Jun 2Oct 6Apr 13Oct 13

"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.