Campbell, CA 95124 Frost Dates
95124, near Campbell, CA: the frost window
Typically, the last spring freeze lands around 02/02, roughly 158 days out. Fall's first freeze usually shows up around 12/06, roughly 310 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Campbell, not a forecast for this year.
Stretching the season past the first frost
Campbell'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.
How much risk comes with planting early here
02/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
Campbell against the rest of the dataset
Campbell's growing season runs about 310 days, ranking 3,559 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,475 of 2,555.
Learn more
Two guides worth reading on 95124: the frost range, on how to read the range around Campbell's dates instead of trusting one, and local microclimates, on what one yard in Campbell can differ from the 95124 normal.