Signal Hill, CA 90815 Frost Dates
90815, near Signal Hill, CA: the frost window
The NOAA station nearest to 90815 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 10a (30 to 35°F average annual minimum).
Signal Hill against the rest of the dataset
At roughly 365 frost-free days, Signal Hill places 1,715 of 40,283 ZIP codes in this dataset. Within CA, it ranks 837 of 2,555.
Learn more
Two guides worth reading on 90815: the methodology, on exactly which NOAA and USDA figures feed 90815's numbers, and zone vs. frost date, on why Zone 10a and Signal Hill's frost date answer different questions.