Calistoga, CA 94515 Frost Dates
Calistoga, CA: when does the frost end?
The last spring frost here typically falls around 03/02, about 186 days from today. Fall's first freeze usually shows up around 11/23, roughly 263 days after the last spring frost.
Calistoga 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 12 weeks until Calistoga's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/02 isn't a guarantee
03/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
Calistoga against the rest of the dataset
About 263 days separate Calistoga's last and first frost, putting it 6,107 of 40,283 ZIP codes nationally. Within CA, it ranks 2,020 of 2,555.
Learn more
Before leaning on 94515's figures: the frost range explains how to read the range around Calistoga's dates instead of trusting one, while local microclimates explains what one yard in Calistoga can differ from the 94515 normal.