Chula Vista, CA 91963 Frost Dates
Chula Vista, CA: when does the frost end?
The last spring frost here typically falls around 04/30, about 245 days from today. Fall's first freeze usually shows up around 10/26, roughly 174 days after the last spring frost.
Zone 9a (20 to 25°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 Chula Vista, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Chula Vista's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Chula Vista's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Chula Vista against the rest of the dataset
About 174 days separate Chula Vista's last and first frost, putting it 27,309 of 40,283 ZIP codes nationally. Within CA, it ranks 2,360 of 2,555.
Learn more
Before leaning on 91963's figures: local microclimates explains what one yard in Chula Vista can differ from the 91963 normal, while zone vs. frost date explains why Zone 9a and Chula Vista's frost date answer different questions.