When to plant in Rossmoor, CA
Planting dates worked out from Rossmoor's own frost records, not a generic zone chart.
Frost is rare in Rossmoor: in 28 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 2
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: Long Beach Daugherty Ap · 6.4 km away · station 10 m, town 4 m. How we match towns to stations
Rossmoor'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 |
|---|---|
| 1949 | Jan 10 |
| 1950 | Jan 26 |
| 1952 | Jan 3 |
| 1963 | Jan 13 |
| 1965 | Jan 2 |
| 1971 | Jan 7 |
| 1973 | Jan 5 |
| 1979 | Jan 29 |
| 1987 | Jan 17 |
| 2002 | Jan 30 |
| 2007 | Jan 15 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1949 | 335 |
| 1950 | 338 |
| 1951 | 363 |
| 1952 | 361 |
| 1953 | 363 |
| 1954 | 363 |
| 1955 | 363 |
| 1956 | 363 |
| 1959 | 363 |
| 1960 | 339 |
| 1961 | 363 |
| 1962 | 360 |
| 1963 | 351 |
| 1964 | 363 |
| 1965 | 362 |
| 1966 | 363 |
| 1967 | 363 |
| 1968 | 353 |
| 1969 | 363 |
| 1970 | 363 |
| 1971 | 357 |
| 1972 | 344 |
| 1973 | 359 |
| 1974 | 356 |
| 1975 | 363 |
| 1976 | 363 |
| 1977 | 363 |
| 1978 | 339 |
| 1979 | 335 |
| 1980 | 363 |
| 1981 | 363 |
| 1982 | 363 |
| 1983 | 363 |
| 1984 | 363 |
| 1985 | 363 |
| 1986 | 363 |
| 1987 | 342 |
| 1988 | 363 |
| 1989 | 363 |
| 1990 | 354 |
| 1991 | 363 |
| 1992 | 363 |
| 1993 | 363 |
| 1994 | 363 |
| 1995 | 363 |
| 1996 | 363 |
| 1997 | 363 |
| 1998 | 363 |
| 1999 | 363 |
| 2000 | 363 |
| 2001 | 363 |
| 2002 | 334 |
| 2003 | 363 |
| 2004 | 363 |
| 2005 | 363 |
| 2006 | 363 |
| 2007 | 349 |
| 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 |
|---|---|
| 1949 | 18.8 °C |
| 1950 | 18.0 °C |
| 1951 | 18.6 °C |
| 1952 | 20.2 °C |
| 1953 | 19.8 °C |
| 1954 | 18.9 °C |
| 1955 | 18.7 °C |
| 1956 | 19.1 °C |
| 1957 | 19.7 °C |
| 1958 | 20.9 °C |
| 1959 | 21.2 °C |
| 1960 | 21.1 °C |
| 1961 | 19.8 °C |
| 1962 | 19.0 °C |
| 1963 | 20.1 °C |
| 1964 | 18.3 °C |
| 1965 | 18.8 °C |
| 1966 | 21.1 °C |
| 1967 | 20.8 °C |
| 1968 | 20.9 °C |
| 1969 | 20.3 °C |
| 1970 | 20.8 °C |
| 1971 | 21.2 °C |
| 1972 | 21.2 °C |
| 1973 | 20.6 °C |
| 1974 | 20.8 °C |
| 1975 | 19.9 °C |
| 1976 | 21.1 °C |
| 1977 | 20.8 °C |
| 1978 | 21.1 °C |
| 1979 | 21.3 °C |
| 1980 | 20.4 °C |
| 1981 | 22.0 °C |
| 1982 | 20.7 °C |
| 1983 | 21.6 °C |
| 1984 | 22.2 °C |
| 1985 | 20.6 °C |
| 1986 | 20.2 °C |
| 1987 | 20.6 °C |
| 1988 | 20.6 °C |
| 1989 | 20.9 °C |
| 1990 | 21.6 °C |
| 1991 | 19.9 °C |
| 1992 | 22.2 °C |
| 1993 | 21.1 °C |
| 1994 | 21.2 °C |
| 1995 | 20.4 °C |
| 1996 | 21.4 °C |
| 1997 | 22.4 °C |
| 1998 | 21.9 °C |
| 1999 | 19.2 °C |
| 2000 | 21.7 °C |
| 2001 | 20.3 °C |
| 2002 | 19.7 °C |
| 2003 | 20.3 °C |
| 2004 | 21.3 °C |
| 2005 | 20.2 °C |
| 2006 | 20.9 °C |
| 2007 | 21.0 °C |
| 2008 | 20.9 °C |
| 2009 | 21.1 °C |
| 2010 | 19.4 °C |
| 2011 | 20.1 °C |
| 2012 | 21.4 °C |
| 2013 | 21.3 °C |
| 2014 | 22.3 °C |
| 2015 | 22.4 °C |
| 2016 | 21.5 °C |
| 2017 | 21.7 °C |
| 2018 | 21.9 °C |
| 2019 | 21.5 °C |
| 2020 | 21.5 °C |
| 2021 | 20.9 °C |
| 2022 | 22.1 °C |
| 2023 | 20.6 °C |
| 2024 | 21.5 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Long Beach Daugherty Ap (NOAA GHCN-Daily). Years with too many missing days are left out.