When to plant in Jamul, CA
Planting dates worked out from Jamul's own frost records, not a generic zone chart.
Frost is rare in Jamul: in 14 of the last 22 springs there was none at all. Frost dates matter less here than heat, so the planting table below is left out.
Station used: El Cajon · 10.5 km away · station 151 m, town 304 m. How we match towns to stations
The station sits 153 m lower than the town, so frost dates here may be off by a week or more. Check them against local experience.
Jamul'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 |
|---|---|
| 1982 | Jan 8 |
| 1983 | Jan 3 |
| 1984 | Feb 17 |
| 1985 | Feb 5 |
| 1987 | Jan 22 |
| 1988 | Mar 16 |
| 1990 | Feb 17 |
| 1993 | Jan 4 |
| 1999 | Feb 13 |
| 2000 | Jan 8 |
| 2001 | Jan 18 |
| 2002 | Feb 3 |
| 2013 | Jan 15 |
| 2019 | Jan 4 |
| 2020 | Feb 5 |
| 2022 | Feb 25 |
| 2023 | Feb 16 |
| 2024 | Jan 8 |
| 2025 | Jan 15 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1980 | 363 |
| 1982 | 356 |
| 1983 | 327 |
| 1984 | 302 |
| 1985 | 309 |
| 1986 | 363 |
| 1990 | 308 |
| 1993 | 352 |
| 1995 | 363 |
| 2000 | 356 |
| 2009 | 363 |
| 2010 | 328 |
| 2011 | 338 |
| 2012 | 352 |
| 2013 | 349 |
| 2014 | 363 |
| 2015 | 359 |
| 2016 | 350 |
| 2017 | 354 |
| 2018 | 361 |
| 2019 | 360 |
| 2020 | 328 |
| 2021 | 363 |
| 2022 | 294 |
| 2023 | 317 |
| 2024 | 356 |
| 2025 | 349 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1980 | 21.3 °C |
| 1982 | 21.3 °C |
| 1983 | 21.7 °C |
| 1986 | 21.2 °C |
| 1995 | 20.8 °C |
| 1999 | 20.7 °C |
| 2000 | 22.4 °C |
| 2001 | 21.8 °C |
| 2006 | 22.8 °C |
| 2008 | 22.5 °C |
| 2010 | 20.8 °C |
| 2011 | 21.0 °C |
| 2012 | 21.6 °C |
| 2013 | 21.6 °C |
| 2014 | 22.8 °C |
| 2015 | 22.4 °C |
| 2016 | 22.2 °C |
| 2017 | 22.3 °C |
| 2018 | 22.4 °C |
| 2019 | 21.5 °C |
| 2020 | 22.6 °C |
| 2021 | 22.1 °C |
| 2022 | 22.1 °C |
| 2023 | 20.7 °C |
| 2024 | 21.4 °C |
| 2025 | 21.3 °C |
| 2026 | 22.5 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from El Cajon (NOAA GHCN-Daily). Years with too many missing days are left out.