Clearlake, CA 95467 Frost Dates
Clearlake, CA: when does the frost end?
Typically, the last spring freeze lands around 04/10, roughly 225 days out. Fall's first freeze usually shows up around 11/06, roughly 209 days after the last spring frost.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Clearlake, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Clearlake's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Clearlake against the rest of the dataset
At roughly 209 frost-free days, Clearlake places 15,168 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,222 of 2,555.
Learn more
Before leaning on 95467's figures: local microclimates explains what one yard in Clearlake can differ from the 95467 normal, while zone vs. frost date explains why Zone 9a and Clearlake's frost date answer different questions.