Chula Vista, CA 91980 Frost Dates
Frost dates for Chula Vista, CA, ZIP 91980
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/26, about 174 frost-free days later.
Chula Vista 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.
What to do before the first frost
Zone 9b around Chula Vista has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Chula Vista compares
About 174 days separate Chula Vista's last and first frost, putting it 27,310 of 40,283 ZIP codes nationally. Within CA, it ranks 2,361 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and Chula Vista's frost date answer different questions, and the frost range explains how to read the range around Chula Vista's dates instead of trusting one.