Rio Dell, CA 95589 Frost Dates
Frost dates for Rio Dell, CA, ZIP 95589
The NOAA station nearest to 95589 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 9b (25 to 30°F average annual minimum).
How Rio Dell compares
At roughly 365 frost-free days, Rio Dell places 1,914 of 40,283 ZIP codes in this dataset. Within CA, it ranks 888 of 2,555.
Learn more
the methodology explains exactly which NOAA and USDA figures feed 95589's numbers, and zone vs. frost date explains why Zone 9b and Rio Dell's frost date answer different questions.