Last Frost Day

Frost history / Tracy Carbona, CA

Tracy Carbona, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00048999, 1951 to 2025, measured from daily minimum temperatures.

Elevation 135 ft, 37.682, -121.347. Download the data (JSON), NOAA daily records

Summary at 32°F

Last spring frostFirst fall frost
MedianFeb 23Nov 28
EarliestJan 9 (1983)Oct 28 (1997)
LatestApr 11 (1981)Dec 26 (1966)
Trend4.8 days earlier per decadelittle change (less than half a day per decade)
Years with data3435, 2 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 22 and the median first fall date is Dec 11.

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)

Dec 31Jan 15Jan 30Feb 14Mar 1Mar 16Mar 31Apr 15Apr 3019601970198019902000201020201951: Mar 31952: Mar 31953: Apr 91954: Mar 181955: Mar 171956: Mar 131957: Feb 61958: Jan 231959: Feb 221960: Feb 211961: Jan 221962: Mar 31963: Mar 171964: Feb 271965: Feb 241966: Mar 41967: Apr 11968: Jan 291969: Feb 41971: Mar 51972: Feb 41974: Feb 241976: Mar 41977: Jan 311978: Jan 281979: Feb 61980: Jan 311981: Apr 111982: Jan 271983: Jan 91989: Feb 141990: Feb 212016: Jan 192023: Feb 23

First fall frost (32°F)

Oct 12Oct 27Nov 11Nov 26Dec 11Dec 26Jan 1019601970198019902000201020201951: Nov 241952: Nov 251953: Nov 191954: Nov 301955: Nov 251956: Nov 211957: Dec 11958: Nov 171959: Dec 21960: Nov 281961: Nov 171962: Nov 301963: Nov 221964: Nov 171965: Nov 281966: Dec 261967: Nov 241968: Dec 31969: Nov 261970: Dec 121971: Oct 301974: Nov 241975: Nov 221976: Nov 281977: Dec 91978: Nov 121979: Dec 121980: Nov 281982: Dec 101988: Nov 301989: Nov 291997: Oct 282025: Dec 2

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
2025no dataDec 2no datanone
2023Feb 23no dataFeb 1no data
2016Jan 19no dataJan 4no data
1997no dataOct 28no dataDec 17
1990Feb 21no dataFeb 15no data
1989Feb 14Nov 29Feb 8Dec 11
1988no dataNov 30no dataDec 4
1983Jan 9no datanoneno data
1982Jan 27Dec 10Jan 10Dec 17
1981Apr 11nonenonenone
1980Jan 31Nov 28noneDec 9
1979Feb 6Dec 12Jan 30Dec 16
1978Jan 28Nov 12noneNov 15
1977Jan 31Dec 9Jan 9none
1976Mar 4Nov 28Mar 1Dec 11
1975no dataNov 22no dataNov 22
1974Feb 24Nov 24Jan 9Dec 25
1973no datanoneno datanone
1972Feb 4no dataJan 15no data
1971Mar 5Oct 30Jan 7Dec 17
1970no dataDec 12no datanone
1969Feb 4Nov 26Jan 10Nov 29
1968Jan 29Dec 3Jan 28Dec 21
1967Apr 1Nov 24Jan 3Dec 14
1966Mar 4Dec 26Mar 4Dec 28
1965Feb 24Nov 28Jan 1Dec 17
1964Feb 27Nov 17Jan 12Nov 19
1963Mar 17Nov 22Jan 25Dec 12
1962Mar 3Nov 30Feb 28Dec 25
1961Jan 22Nov 17Jan 21Dec 10
1960Feb 21Nov 28Jan 17Dec 8
1959Feb 22Dec 2Jan 4Dec 7
1958Jan 23Nov 17Jan 23none
1957Feb 6Dec 1Feb 5Dec 3
1956Mar 13Nov 21Feb 17Nov 22
1955Mar 17Nov 25Jan 12none
1954Mar 18Nov 30Feb 8Nov 30
1953Apr 9Nov 19Feb 20Dec 23
1952Mar 3Nov 25Jan 5Nov 25
1951Mar 3Nov 24Feb 1Dec 21

"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.