Holtville, CA 92250 Frost Dates
92250, near Holtville, CA: the frost window
The last spring frost here typically falls around 01/03, about 128 days from today. Fall's first freeze usually shows up around 12/27, roughly 363 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Holtville in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Holtville's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/03 isn't a guarantee
01/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/15 and only about 1 year in 10 sees frost after that.
Holtville against the rest of the dataset
Holtville's growing season runs about 363 days, ranking 2,047 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 933 of 2,555.
Learn more
Two guides worth reading on 92250: local microclimates, on what one yard in Holtville can differ from the 92250 normal, and zone vs. frost date, on why Zone 10a and Holtville's frost date answer different questions.