Alturas, CA 96015 Frost Dates
Alturas, CA: when does the frost end?
The last spring frost here typically falls around 06/01, about 277 days from today. Fall's first freeze usually shows up around 09/16, roughly 106 days after the last spring frost.
Zone 7a (0 to 5°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 Alturas, not a forecast for this year.
Stretching the season past the first frost
With roughly 3 weeks until Alturas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Alturas's last frost
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/20 and only about 1 year in 10 sees frost after that.
Alturas against the rest of the dataset
Alturas's growing season runs about 106 days, ranking 39,582 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,510 of 2,555.
Learn more
Before leaning on 96015's figures: the frost range explains how to read the range around Alturas's dates instead of trusting one, while local microclimates explains what one yard in Alturas can differ from the 96015 normal.