Campbell, CA 95128 Frost Dates
95128, near Campbell, CA: the frost window
Typically, the last spring freeze lands around 01/02, roughly 127 days out. Fall's first freeze usually shows up around 12/25, roughly 362 days after the last spring frost.
Campbell sits in USDA Zone 9b (25 to 30°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.
Stretching the season past the first frost
Campbell's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/02 isn't a guarantee
01/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/14 and only about 1 year in 10 sees frost after that.
Campbell against the rest of the dataset
About 362 days separate Campbell's last and first frost, putting it 2,068 of 40,283 ZIP codes nationally. Within CA, it ranks 954 of 2,555.
Learn more
Two guides worth reading on 95128: local microclimates, on what one yard in Campbell can differ from the 95128 normal, and zone vs. frost date, on why Zone 9b and Campbell's frost date answer different questions.