Walnut Creek, CA 94596 Frost Dates
Walnut Creek, CA: when does the frost end?
Around 01/07 is the usual last spring frost, about 132 days away. Fall's first freeze usually shows up around 12/19, roughly 346 days after the last spring frost.
Walnut Creek 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
With roughly 16 weeks until Walnut Creek's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Walnut Creek's last frost
01/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/19 and only about 1 year in 10 sees frost after that.
Walnut Creek against the rest of the dataset
At roughly 346 frost-free days, Walnut Creek places 2,420 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,102 of 2,555.
Learn more
Before leaning on 94596's figures: the frost range explains how to read the range around Walnut Creek's dates instead of trusting one, while local microclimates explains what one yard in Walnut Creek can differ from the 94596 normal.