Millbrae, CA 94128 Frost Dates
When can you plant in Millbrae, CA?
The last spring frost here typically falls around 12/29, about 123 days from today. The first fall frost typically arrives around 12/26, about 365 frost-free days later.
Millbrae 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 17 weeks of growing season left in Millbrae before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Millbrae's last frost
12/29 is the middle of 30 years of NOAA records, not a promise. Plant by 01/13 and you're betting against frost in roughly 9 years out of 10. 12/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Millbrae compares
About 365 days separate Millbrae's last and first frost, putting it 1,201 of 40,283 ZIP codes nationally. Within CA, it ranks 520 of 2,555.
Learn more
zone vs. frost date covers why Zone 10a and Millbrae's frost date answer different questions. the frost range covers how to read the range around Millbrae's dates instead of trusting one.