Barstow, CA 92310 Frost Dates
92310, near Barstow, CA: the frost window
The last spring frost here typically falls around 02/19, about 175 days from today. Fall's first freeze usually shows up around 11/26, roughly 279 days after the last spring frost.
Barstow sits in USDA Zone 9a (20 to 25°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
Barstow's growing season runs out in roughly 13 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
02/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/11 and only about 1 year in 10 sees frost after that.
Barstow against the rest of the dataset
Barstow's growing season runs about 279 days, ranking 4,867 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,787 of 2,555.
Learn more
Two guides worth reading on 92310: the frost range, on how to read the range around Barstow's dates instead of trusting one, and local microclimates, on what one yard in Barstow can differ from the 92310 normal.