Norco, CA 92860 Frost Dates
When can you plant in Norco, CA?
Typically, the last spring freeze lands around 01/17, roughly 142 days out. The first fall frost typically arrives around 12/19, about 335 frost-free days later.
Norco 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
About 16 weeks of growing season left in Norco 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
01/17 is the middle of 30 years of NOAA records, not a promise. Plant by 02/22 and you're betting against frost in roughly 9 years out of 10. 12/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Norco compares
About 335 days separate Norco's last and first frost, putting it 2,743 of 40,283 ZIP codes nationally. Within CA, it ranks 1,239 of 2,555.
Learn more
zone vs. frost date covers why Zone 10a and Norco's frost date answer different questions. the frost range covers how to read the range around Norco's dates instead of trusting one.