Morro Bay, CA 93452 Frost Dates
Morro Bay, CA: when does the frost end?
Around 02/13 is the usual last spring frost, about 169 days away. Fall's first freeze usually shows up around 02/01, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Morro Bay in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 22 weeks until Morro Bay's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
02/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/29 and only about 1 year in 10 sees frost after that.
Morro Bay against the rest of the dataset
About 365 days separate Morro Bay's last and first frost, putting it 1,732 of 40,283 ZIP codes nationally. Within CA, it ranks 853 of 2,555.
Learn more
Before leaning on 93452's figures: the frost range explains how to read the range around Morro Bay's dates instead of trusting one, while local microclimates explains what one yard in Morro Bay can differ from the 93452 normal.