Morro Bay, CA 93428 Frost Dates
When can you plant in Morro Bay, CA?
The last spring frost here typically falls around 02/13, about 169 days from today. The first fall frost typically arrives around 02/01, about 365 frost-free days later.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Morro Bay, not a forecast for this year.
What to do before the first frost
About 22 weeks of growing season left in Morro Bay before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Morro Bay's last frost
02/13 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 12/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morro Bay compares
About 365 days separate Morro Bay's last and first frost, putting it 1,729 of 40,283 ZIP codes nationally. Within CA, it ranks 850 of 2,555.
Learn more
the frost range covers how to read the range around Morro Bay's dates instead of trusting one. local microclimates covers what one yard in Morro Bay can differ from the 93428 normal.