Clearlake, CA 95451 Frost Dates
When can you plant in Clearlake, CA?
Around 04/10 is the usual last spring frost, about 225 days away. The first fall frost typically arrives around 11/06, about 209 frost-free days later.
The USDA Plant Hardiness Zone Map puts Clearlake 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 10 weeks of growing season left in Clearlake before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Clearlake's last frost
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/24 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Clearlake compares
At roughly 209 frost-free days, Clearlake places 15,165 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,219 of 2,555.
Learn more
zone vs. frost date covers why Zone 9b and Clearlake's frost date answer different questions. the frost range covers how to read the range around Clearlake's dates instead of trusting one.