San Bernardino, CA 92352 Frost Dates
When can you plant in San Bernardino, CA?
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 11/02, about 176 frost-free days later.
San Bernardino sits in USDA Zone 8b (15 to 20°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
About 9 weeks of growing season left in San Bernardino before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 San Bernardino compares
At roughly 176 frost-free days, San Bernardino places 26,321 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,351 of 2,555.
Learn more
the frost range covers how to read the range around San Bernardino's dates instead of trusting one. local microclimates covers what one yard in San Bernardino can differ from the 92352 normal.