West Covina, CA 91790 Frost Dates
When can you plant in West Covina, CA?
The last spring frost here typically falls around 01/04, about 129 days from today. The first fall frost typically arrives around 01/02, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts West Covina 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
About 18 weeks of growing season left in West Covina before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 01/04 isn't a guarantee
01/04 is the middle of 30 years of NOAA records, not a promise. Plant by 01/28 and you're betting against frost in roughly 9 years out of 10. 12/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How West Covina compares
At roughly 365 frost-free days, West Covina places 483 of 40,283 ZIP codes in this dataset. Within CA, it ranks 199 of 2,555.
Learn more
zone vs. frost date covers why Zone 10a and West Covina's frost date answer different questions. the frost range covers how to read the range around West Covina's dates instead of trusting one.