Santa Clarita, CA 91390 Frost Dates
When can you plant in Santa Clarita, CA?
Typically, the last spring freeze lands around 03/10, roughly 194 days out. The first fall frost typically arrives around 11/19, about 248 frost-free days later.
Santa Clarita sits in USDA Zone 9b (25 to 30°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 12 weeks of growing season left in Santa Clarita before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/10 isn't a guarantee
03/10 is the middle of 30 years of NOAA records, not a promise. Plant by 02/12 and you're betting against frost in roughly 9 years out of 10. 04/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Santa Clarita compares
About 248 days separate Santa Clarita's last and first frost, putting it 7,672 of 40,283 ZIP codes nationally. Within CA, it ranks 2,096 of 2,555.
Learn more
zone vs. frost date covers why Zone 9b and Santa Clarita's frost date answer different questions. the frost range covers how to read the range around Santa Clarita's dates instead of trusting one.