Williams, CA 95955 Frost Dates
Williams, CA: when does the frost end?
Around 02/14 is the usual last spring frost, about 170 days away. Fall's first freeze usually shows up around 12/01, roughly 293 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Williams in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 14 weeks until Williams'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
02/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/31 and only about 1 year in 10 sees frost after that.
Williams against the rest of the dataset
Williams's growing season runs about 293 days, ranking 4,292 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,668 of 2,555.
Learn more
Before leaning on 95955's figures: zone vs. frost date explains why Zone 9b and Williams's frost date answer different questions, while the frost range explains how to read the range around Williams's dates instead of trusting one.