Rio Dell, CA 95528 Frost Dates
Rio Dell, CA: when does the frost end?
Typically, the last spring freeze lands around 03/04, roughly 188 days out. Fall's first freeze usually shows up around 11/22, roughly 264 days after the last spring frost.
Rio Dell sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 12 weeks until Rio Dell's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Rio Dell's last frost
03/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/08 and only about 1 year in 10 sees frost after that.
Rio Dell against the rest of the dataset
At roughly 264 frost-free days, Rio Dell places 6,064 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,005 of 2,555.
Learn more
Before leaning on 95528's figures: the frost range explains how to read the range around Rio Dell's dates instead of trusting one, while local microclimates explains what one yard in Rio Dell can differ from the 95528 normal.