Barstow, CA 92309 Frost Dates
Barstow, CA: when does the frost end?
The last spring frost here typically falls around 02/14, about 170 days from today. Fall's first freeze usually shows up around 11/27, roughly 287 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Barstow in Zone 9a (20 to 25°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
With roughly 13 weeks until Barstow's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Barstow's last frost
02/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/04 and only about 1 year in 10 sees frost after that.
Barstow against the rest of the dataset
About 287 days separate Barstow's last and first frost, putting it 4,582 of 40,283 ZIP codes nationally. Within CA, it ranks 1,720 of 2,555.
Learn more
Before leaning on 92309's figures: zone vs. frost date explains why Zone 9a and Barstow's frost date answer different questions, while the frost range explains how to read the range around Barstow's dates instead of trusting one.