Sunnyvale, CA 95002 Frost Dates
95002, near Sunnyvale, CA: the frost window
Typically, the last spring freeze lands around 01/06, roughly 131 days out. Fall's first freeze usually shows up around 12/23, roughly 353 days after the last spring frost.
Sunnyvale sits in USDA Zone 10a (30 to 35°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
Sunnyvale'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.
The actual range around Sunnyvale's last frost
01/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/16 and only about 1 year in 10 sees frost after that.
Sunnyvale against the rest of the dataset
About 353 days separate Sunnyvale's last and first frost, putting it 2,213 of 40,283 ZIP codes nationally. Within CA, it ranks 993 of 2,555.
Learn more
Two guides worth reading on 95002: the frost range, on how to read the range around Sunnyvale's dates instead of trusting one, and local microclimates, on what one yard in Sunnyvale can differ from the 95002 normal.