When to plant in Millbrae, CA

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

Frost is rare in Millbrae: in 29 of the last 30 springs there was none at all. Frost dates matter less here than heat, so the planting table below is left out.

Safe to plant out

Jan 1

1 year in 10 has a later frost

Average last frost

Jan 1

about a 50% chance of a later one

Average first fall frost

Dec 31

1 year in 10 by Dec 31

Frost-free days

363

median, 1991–2020

Station used: San Francisco Intl Ap · 3.0 km away · station 3 m, town 10 m. How we match towns to stations

Millbrae'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
1946	Feb 13
1947	Jan 18
1949	Feb 14
1950	Feb 2
1951	Mar 3
1952	Jan 3
1954	Jan 25
1955	Feb 4
1956	Feb 1
1957	Jan 10
1960	Jan 2
1961	Jan 4
1962	Jan 24
1963	Jan 20
1966	Mar 3
1968	Jan 6
1971	Jan 5
1972	Jan 5
1973	Jan 7
1974	Jan 8
1975	Jan 30
1976	Jan 2
1979	Feb 3
1980	Jan 30
1989	Feb 7
2007	Jan 14

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1947	346
1948	354
1949	300
1950	331
1951	281
1952	324
1953	363
1954	308
1955	329
1956	332
1957	354
1958	363
1959	363
1960	362
1961	360
1962	334
1963	344
1964	363
1965	349
1966	299
1967	347
1968	348
1969	363
1970	363
1971	359
1972	333
1973	357
1974	350
1975	334
1976	362
1977	363
1978	340
1979	330
1980	334
1981	363
1982	363
1983	363
1984	363
1985	363
1986	363
1987	363
1988	363
1989	326
1990	353
1991	363
1992	363
1993	363
1994	363
1995	363
1996	363
1997	363
1998	353
1999	363
2000	363
2001	363
2002	363
2003	363
2004	363
2005	363
2006	363
2007	350
2008	363
2009	363
2010	363
2011	363
2012	363
2013	363
2014	363
2015	363
2016	363
2017	363
2018	363
2019	363
2020	363
2021	363
2022	363
2023	363
2024	363

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

See the data as a table

Year	Growing-season temperature
1946	14.7 °C
1947	15.8 °C
1948	14.6 °C
1949	14.8 °C
1950	15.2 °C
1951	14.7 °C
1952	15.1 °C
1953	14.9 °C
1954	15.3 °C
1955	14.5 °C
1956	15.7 °C
1957	16.6 °C
1958	18.1 °C
1959	16.9 °C
1960	16.0 °C
1961	16.5 °C
1962	15.3 °C
1963	15.6 °C
1964	15.7 °C
1965	14.9 °C
1966	15.8 °C
1967	15.6 °C
1968	15.8 °C
1969	15.9 °C
1970	16.0 °C
1971	15.7 °C
1972	16.0 °C
1973	16.0 °C
1974	15.6 °C
1975	15.1 °C
1976	16.0 °C
1977	15.7 °C
1978	16.1 °C
1979	16.6 °C
1980	15.5 °C
1981	16.2 °C
1982	15.6 °C
1983	16.9 °C
1984	17.3 °C
1985	16.9 °C
1986	15.9 °C
1987	17.0 °C
1988	16.7 °C
1989	16.6 °C
1990	17.1 °C
1991	15.8 °C
1992	17.6 °C
1993	17.4 °C
1994	16.2 °C
1995	15.9 °C
1996	16.5 °C
1997	17.8 °C
1998	16.2 °C
1999	15.4 °C
2000	16.7 °C
2001	16.3 °C
2002	16.4 °C
2003	16.7 °C
2004	17.4 °C
2005	16.5 °C
2006	16.5 °C
2007	16.4 °C
2008	16.3 °C
2009	16.7 °C
2010	16.5 °C
2011	15.8 °C
2012	15.7 °C
2013	16.9 °C
2014	18.4 °C
2015	17.6 °C
2016	17.1 °C
2017	17.6 °C
2019	17.8 °C
2020	17.8 °C
2021	17.2 °C
2022	17.4 °C
2023	17.1 °C
2024	16.4 °C

What this means for you: This station's record is too short to show a reliable trend yet.

Source: daily records from San Francisco Intl Ap (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

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