Alturas, CA 96068 Frost Dates
Alturas, CA: when does the frost end?
The last spring frost here typically falls around 05/28, about 273 days from today. Fall's first freeze usually shows up around 09/29, roughly 125 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Alturas in Zone 7a (0 to 5°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 5 weeks until Alturas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/28 isn't a guarantee
05/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/16 and only about 1 year in 10 sees frost after that.
Alturas against the rest of the dataset
Alturas's growing season runs about 125 days, ranking 38,765 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,483 of 2,555.
Learn more
Before leaning on 96068's figures: zone vs. frost date explains why Zone 7a and Alturas's frost date answer different questions, while the frost range explains how to read the range around Alturas's dates instead of trusting one.