West Sacramento, CA 95831 Frost Dates
95831, near West Sacramento, CA: the frost window
Around 02/02 is the usual last spring frost, about 158 days away. Fall's first freeze usually shows up around 12/02, roughly 301 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts West Sacramento 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
West Sacramento's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 02/02 isn't a guarantee
02/02 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 03/05 and only about 1 year in 10 sees frost after that.
West Sacramento against the rest of the dataset
West Sacramento's growing season runs about 301 days, ranking 3,910 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,629 of 2,555.
Learn more
Two guides worth reading on 95831: zone vs. frost date, on why Zone 9b and West Sacramento's frost date answer different questions, and the frost range, on how to read the range around West Sacramento's dates instead of trusting one.