Rio Dell, CA 95565 Frost Dates
When can you plant in Rio Dell, CA?
The last spring frost here typically falls around 03/04, about 188 days from today. The first fall frost typically arrives around 11/22, about 264 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rio Dell in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 12 weeks of growing season left in Rio Dell before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/04 isn't a guarantee
03/04 is the middle of 30 years of NOAA records, not a promise. Plant by 01/27 and you're betting against frost in roughly 9 years out of 10. 04/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rio Dell compares
About 264 days separate Rio Dell's last and first frost, putting it 6,069 of 40,283 ZIP codes nationally. Within CA, it ranks 2,010 of 2,555.
Learn more
the frost range covers how to read the range around Rio Dell's dates instead of trusting one. local microclimates covers what one yard in Rio Dell can differ from the 95565 normal.