Highland, CA 92341 Frost Dates
Frost dates for Highland, CA, ZIP 92341
Around 05/05 is the usual last spring frost, about 250 days away. The first fall frost typically arrives around 11/02, about 176 frost-free days later.
Zone 7b (5 to 10°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 Highland, not a forecast for this year.
What to do before the first frost
Zone 7b around Highland has about 9 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.
How much risk comes with planting early here
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Highland compares
About 176 days separate Highland's last and first frost, putting it 26,353 of 40,283 ZIP codes nationally. Within CA, it ranks 2,355 of 2,555.
Learn more
local microclimates explains what one yard in Highland can differ from the 92341 normal, and zone vs. frost date explains why Zone 7b and Highland's frost date answer different questions.