Costa Mesa, CA 92663 Frost Dates
92663, near Costa Mesa, CA: the frost window
The NOAA station nearest to 92663 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).
Costa Mesa against the rest of the dataset
At roughly 365 frost-free days, Costa Mesa places 473 of 40,283 ZIP codes in this dataset. Within CA, it ranks 196 of 2,555.
Learn more
Two guides worth reading on 92663: the methodology, on exactly which NOAA and USDA figures feed 92663's numbers, and zone vs. frost date, on why Zone 10b and Costa Mesa's frost date answer different questions.