Clearlake, CA 95424 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.
Clearlake sits in USDA Zone 9a (20 to 25°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.
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.
How much risk comes with planting early here
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
About 209 days separate Clearlake's last and first frost, putting it 15,162 of 40,283 ZIP codes nationally. Within CA, it ranks 2,216 of 2,555.
Learn more
the frost range covers how to read the range around Clearlake's dates instead of trusting one. local microclimates covers what one yard in Clearlake can differ from the 95424 normal.