Vista, CA 92003 Frost Dates
92003, near Vista, CA: the frost window
Around 02/16 is the usual last spring frost, about 172 days away. Fall's first freeze usually shows up around 12/08, roughly 298 days after the last spring frost.
Zone 10a (30 to 35°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 Vista, not a forecast for this year.
Stretching the season past the first frost
Vista's growing season runs out in roughly 15 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
02/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
Vista against the rest of the dataset
At roughly 298 frost-free days, Vista places 4,199 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,641 of 2,555.
Learn more
Two guides worth reading on 92003: the frost range, on how to read the range around Vista's dates instead of trusting one, and local microclimates, on what one yard in Vista can differ from the 92003 normal.