Montclair, CA 91762 Frost Dates
Frost dates for Montclair, CA, ZIP 91762
Typically, the last spring freeze lands around 01/04, roughly 129 days out. The first fall frost typically arrives around 12/30, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts Montclair in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 10a around Montclair has about 18 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 Montclair's last frost
01/04 is the middle of 30 years of NOAA records, not a promise. Plant by 02/07 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Montclair compares
About 365 days separate Montclair's last and first frost, putting it 992 of 40,283 ZIP codes nationally. Within CA, it ranks 419 of 2,555.
Learn more
the frost range explains how to read the range around Montclair's dates instead of trusting one, and local microclimates explains what one yard in Montclair can differ from the 91762 normal.