When to plant in Janesville, CA

Planting dates worked out from Janesville's own frost records, not a generic zone chart.

Safe to plant out

Jun 11

1 year in 10 has a later frost

Average last frost

May 24

about a 50% chance of a later one

Average first fall frost

Oct 2

1 year in 10 by Sep 11

Frost-free days

126

median, 1991–2020

Station used: Susanville 2sw · 17.8 km away · station 1284 m, town 1292 m. How we match towns to stations

This season

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Planting dates for common crops

Crop	Start indoors	Plant out or sow	Harvest from
Tomato	Apr 16 – Apr 30	Jun 11 – Jun 25	Aug 5
Sweet pepper	Apr 2 – Apr 16	Jun 11 – Jun 25	Aug 10
Lettuce (leaf)	Mar 22 – Mar 29	Apr 26 – May 10	Jun 5
Peas	—	Apr 12 – May 10	Jun 6
Bush beans	—	Jun 4 – Jun 25	Jul 24
Carrot	—	May 3 – Jun 14	Jul 2
Beet	—	Apr 26 – Jun 7	Jun 15
Potato	—	May 3 – May 24	Jul 12
Kale	Mar 15 – Mar 29	Apr 26 – May 10	Jun 8
Broccoli	Mar 15 – Mar 29	Apr 26 – May 17	Jun 25
Cucumber	May 14 – May 21	Jun 11 – Jun 25	Jul 31
Summer squash and zucchini	May 14 – May 21	Jun 11 – Jun 25	Jul 26
Winter squash	May 14 – May 21	Jun 11 – Jun 25	Aug 30
Sweet corn	—	Jun 4 – Jun 25	Aug 3
Onion (from sets)	—	Apr 26 – May 17	Jul 25
Garlic	—	Sep 18 – Oct 16 (fall)	following summer
Spinach	—	Apr 12 – May 10	May 20
Basil	Apr 30 – May 14	Jun 11 – Jun 25	Aug 7

Plan all 65 crops for Janesville

Janesville's weather over time

How the growing season has shifted here, year by year, from the station's own records.

Each year's last spring frostLong-term trend

See the data as a table

Year	Last spring frost
1896	May 17
1897	Apr 23
1898	May 19
1899	May 25
1900	May 12
1901	May 19
1902	May 3
1904	May 1
1905	May 22
1906	Jun 7
1907	May 20
1908	Jun 22
1909	May 24
1910	Jun 21
1911	May 29
1912	May 22
1914	Jun 5
1915	Jun 12
1928	May 2
1929	Jun 1
1930	May 21
1931	Apr 24
1932	May 21
1933	May 18
1934	Apr 3
1935	May 17
1936	May 29
1937	May 7
1938	May 7
1939	May 19
1940	May 5
1941	May 19
1942	May 13
1943	Jun 3
1944	Jun 15
1945	Jun 15
1946	May 29
1947	Jun 29
1948	May 28
1950	Jun 25
1951	Jun 3
1952	Jun 15
1953	Jun 13
1954	Jun 17
1955	Jul 5
1956	Jun 5
1957	Jun 16
1958	Jun 5
1959	Jun 10
1960	May 23
1961	May 28
1962	Jun 5
1963	Jun 29
1965	May 11
1966	Jun 4
1967	May 16
1968	Jun 30
1969	Apr 30
1970	May 12
1971	Jun 2
1972	May 9
1973	Jun 18
1974	May 21
1975	May 20
1976	Jul 1
1977	May 28
1978	Jun 25
1979	May 30
1980	Jun 6
1981	Jun 13
1983	May 17
1984	May 16
1985	May 30
1986	May 22
1987	May 3
1988	Jun 8
1989	May 29
1990	Jun 1
1993	Jun 12
1994	Jun 18
2002	May 21
2005	Jun 7
2006	Apr 19
2007	Jun 7
2008	May 26
2010	May 29
2011	Jun 3
2012	May 8
2013	May 24
2014	May 11
2015	May 16
2016	Apr 26
2017	May 18
2018	Jun 10
2019	May 18
2020	Jun 8
2021	May 25
2022	May 31
2023	Jun 20

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1896	163
1897	174
1898	132
1899	129
1900	124
1901	111
1902	145
1904	163
1905	129
1906	118
1907	104
1908	68
1909	110
1910	83
1911	110
1914	98
1928	160
1929	116
1931	164
1932	148
1933	154
1934	172
1935	150
1936	107
1937	149
1938	162
1939	140
1940	180
1941	123
1942	152
1943	130
1944	143
1945	99
1946	110
1947	80
1948	119
1950	57
1952	73
1953	101
1954	86
1955	78
1956	97
1957	94
1958	110
1959	71
1960	91
1961	116
1962	121
1963	105
1965	128
1966	120
1967	120
1968	81
1969	155
1970	124
1971	107
1973	99
1975	139
1976	46
1977	115
1978	74
1979	118
1980	99
1981	100
1983	125
1984	128
1985	102
1986	121
1987	163
1988	101
1989	126
1993	73
2005	108
2008	136
2010	149
2011	124
2012	167
2013	125
2014	168
2015	165
2016	158
2017	127
2018	97
2019	118
2020	122
2021	113
2022	144

Each year's average temperature, April to SeptemberLong-term trend

See the data as a table

Year	Growing-season temperature
1895	18.0 °C
1896	17.1 °C
1897	18.0 °C
1898	15.3 °C
1899	14.3 °C
1900	14.7 °C
1901	16.0 °C
1902	15.5 °C
1903	14.4 °C
1904	15.6 °C
1905	14.8 °C
1906	15.2 °C
1907	14.6 °C
1908	14.6 °C
1909	14.4 °C
1910	16.5 °C
1911	13.6 °C
1914	17.2 °C
1928	17.5 °C
1929	16.6 °C
1930	16.6 °C
1931	18.2 °C
1932	17.0 °C
1933	16.5 °C
1934	17.9 °C
1935	17.3 °C
1936	17.2 °C
1937	17.1 °C
1938	16.5 °C
1939	17.1 °C
1940	17.0 °C
1941	15.0 °C
1942	16.2 °C
1943	16.8 °C
1944	15.0 °C
1945	16.1 °C
1946	16.6 °C
1947	14.8 °C
1948	13.6 °C
1950	15.3 °C
1951	15.7 °C
1952	15.6 °C
1953	14.2 °C
1954	15.2 °C
1955	14.6 °C
1957	14.9 °C
1958	15.5 °C
1959	16.0 °C
1960	16.2 °C
1961	15.9 °C
1962	16.1 °C
1963	15.0 °C
1965	14.9 °C
1966	16.7 °C
1967	15.8 °C
1968	15.6 °C
1969	16.6 °C
1970	15.6 °C
1971	15.4 °C
1972	16.4 °C
1973	16.7 °C
1974	15.9 °C
1975	15.0 °C
1976	14.9 °C
1977	16.3 °C
1978	15.3 °C
1979	16.2 °C
1980	15.5 °C
1981	16.8 °C
1983	14.5 °C
1984	16.0 °C
1985	16.0 °C
1986	15.6 °C
1987	16.9 °C
1988	16.8 °C
1989	15.9 °C
1990	16.1 °C
1993	13.6 °C
1994	14.8 °C
2005	15.5 °C
2010	15.1 °C
2011	15.2 °C
2013	16.7 °C
2014	17.2 °C
2015	17.0 °C
2016	17.0 °C
2017	17.2 °C
2018	17.1 °C
2019	16.1 °C
2020	16.7 °C
2021	17.5 °C
2022	16.1 °C
2023	15.7 °C

What this means for you: Since 1896, Janesville's last spring frost has stayed at about the same time of year. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Susanville 2sw (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

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