Los Altos Hills, CA 94022 Frost Dates
Frost dates for Los Altos Hills, CA, ZIP 94022
The last spring frost here typically falls around 01/06, about 131 days from today. The first fall frost typically arrives around 12/23, about 353 frost-free days later.
Zone 9b (25 to 30°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 Los Altos Hills, not a forecast for this year.
What to do before the first frost
Zone 9b around Los Altos Hills has about 17 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Los Altos Hills's last frost
01/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/04 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Los Altos Hills compares
About 353 days separate Los Altos Hills's last and first frost, putting it 2,245 of 40,283 ZIP codes nationally. Within CA, it ranks 1,004 of 2,555.
Learn more
local microclimates explains what one yard in Los Altos Hills can differ from the 94022 normal, and zone vs. frost date explains why Zone 9b and Los Altos Hills's frost date answer different questions.