San Bernardino, CA 92404 Frost Dates
Frost dates for San Bernardino, CA, ZIP 92404
The last spring frost here typically falls around 05/05, about 250 days from today. The first fall frost typically arrives around 11/02, about 176 frost-free days later.
San Bernardino sits in USDA Zone 10a (30 to 35°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 10a around San Bernardino 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.
The actual range around San Bernardino's last frost
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 San Bernardino compares
At roughly 176 frost-free days, San Bernardino places 26,322 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,352 of 2,555.
Learn more
the frost range explains how to read the range around San Bernardino's dates instead of trusting one, and local microclimates explains what one yard in San Bernardino can differ from the 92404 normal.