San Diego, CA 92109 Frost Dates
When can you plant in San Diego, CA?
The NOAA station nearest to 92109 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 10b (35 to 40°F average annual minimum).
How San Diego compares
At roughly 365 frost-free days, San Diego places 15 of 40,283 ZIP codes in this dataset. Within CA, it ranks 8 of 2,555.
Learn more
the methodology covers exactly which NOAA and USDA figures feed 92109's numbers. zone vs. frost date covers why Zone 10b and San Diego's frost date answer different questions.