Willows, CA 95939 Frost Dates
When can you plant in Willows, CA?
The last spring frost here typically falls around 04/05, about 220 days from today. The first fall frost typically arrives around 11/13, about 220 frost-free days later.
Willows 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 11 weeks of growing season left in Willows 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
04/05 is the middle of 30 years of NOAA records, not a promise. Plant by 03/08 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Willows compares
At roughly 220 frost-free days, Willows places 12,795 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,182 of 2,555.
Learn more
zone vs. frost date covers why Zone 9a and Willows's frost date answer different questions. the frost range covers how to read the range around Willows's dates instead of trusting one.