When to plant in Colma, CA
Planting dates worked out from Colma's own frost records, not a generic zone chart.
Frost is rare in Colma: in 14 of the last 15 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 4
about a 50% chance of a later one
Average first fall frost
Dec 28
1 year in 10 by Dec 18
Frost-free days
363
median, 1991–2020
Station used: San Francisco Oceanside · 7.0 km away · station 2 m, town 37 m. How we match towns to stations
Colma'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 |
|---|---|
| 1960 | Feb 26 |
| 1962 | Jan 24 |
| 1963 | Jan 13 |
| 1971 | Jan 5 |
| 1972 | Feb 2 |
| 1974 | Jan 8 |
| 1975 | Jan 30 |
| 1976 | Feb 7 |
| 1979 | Jan 29 |
| 1981 | Jan 9 |
| 1989 | Jan 6 |
| 1990 | Feb 15 |
| 2008 | Feb 11 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1959 | 363 |
| 1960 | 298 |
| 1961 | 363 |
| 1962 | 334 |
| 1963 | 351 |
| 1964 | 363 |
| 1965 | 353 |
| 1966 | 363 |
| 1967 | 363 |
| 1968 | 353 |
| 1969 | 363 |
| 1970 | 363 |
| 1971 | 359 |
| 1972 | 305 |
| 1973 | 363 |
| 1974 | 356 |
| 1975 | 334 |
| 1976 | 326 |
| 1977 | 363 |
| 1978 | 363 |
| 1979 | 335 |
| 1980 | 363 |
| 1981 | 355 |
| 1984 | 363 |
| 1989 | 358 |
| 1990 | 308 |
| 1991 | 363 |
| 1994 | 363 |
| 1995 | 363 |
| 1996 | 363 |
| 1997 | 363 |
| 1998 | 353 |
| 1999 | 363 |
| 2000 | 363 |
| 2008 | 322 |
| 2009 | 363 |
| 2012 | 348 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1959 | 14.6 °C |
| 1961 | 13.9 °C |
| 1962 | 13.3 °C |
| 1963 | 14.2 °C |
| 1964 | 13.7 °C |
| 1965 | 13.3 °C |
| 1966 | 14.7 °C |
| 1967 | 14.2 °C |
| 1968 | 13.9 °C |
| 1969 | 13.8 °C |
| 1970 | 13.1 °C |
| 1971 | 13.3 °C |
| 1972 | 13.8 °C |
| 1973 | 13.8 °C |
| 1974 | 13.8 °C |
| 1975 | 13.2 °C |
| 1976 | 14.4 °C |
| 1977 | 14.2 °C |
| 1978 | 14.7 °C |
| 1979 | 14.8 °C |
| 1980 | 14.7 °C |
| 1984 | 14.5 °C |
| 1986 | 13.7 °C |
| 1989 | 14.6 °C |
| 1990 | 15.1 °C |
| 1991 | 13.7 °C |
| 1994 | 13.6 °C |
| 1995 | 14.0 °C |
| 1996 | 13.6 °C |
| 1997 | 15.0 °C |
| 1998 | 13.9 °C |
| 1999 | 12.8 °C |
| 2000 | 14.0 °C |
| 2001 | 13.4 °C |
| 2002 | 13.4 °C |
| 2003 | 14.2 °C |
| 2004 | 14.5 °C |
| 2006 | 13.8 °C |
| 2008 | 13.1 °C |
| 2012 | 12.6 °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 Oceanside (NOAA GHCN-Daily). Years with too many missing days are left out.