Campbell, CA 95126 Frost Dates
Campbell, CA: when does the frost end?
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.
The USDA Plant Hardiness Zone Map puts Campbell 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 17 weeks until Campbell's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
Campbell's growing season runs about 362 days, ranking 2,067 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 953 of 2,555.
Learn more
Before leaning on 95126's figures: the frost range explains how to read the range around Campbell's dates instead of trusting one, while local microclimates explains what one yard in Campbell can differ from the 95126 normal.