Fullerton, CA 92801 Frost Dates
92801, near Fullerton, CA: the frost window
The NOAA station nearest to 92801 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).
Fullerton against the rest of the dataset
Fullerton's growing season runs about 365 days, ranking 406 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 149 of 2,555.
Learn more
Two guides worth reading on 92801: the methodology, on exactly which NOAA and USDA figures feed 92801's numbers, and zone vs. frost date, on why Zone 10b and Fullerton's frost date answer different questions.