Plymouth, CA 95656 Frost Dates
Plymouth, CA: when does the frost end?
Typically, the last spring freeze lands around 03/31, roughly 215 days out. Fall's first freeze usually shows up around 11/21, roughly 237 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Plymouth in Zone 9a (20 to 25°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 12 weeks until Plymouth'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
03/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Plymouth against the rest of the dataset
About 237 days separate Plymouth's last and first frost, putting it 9,132 of 40,283 ZIP codes nationally. Within CA, it ranks 2,140 of 2,555.
Learn more
Before leaning on 95656's figures: the frost range explains how to read the range around Plymouth's dates instead of trusting one, while local microclimates explains what one yard in Plymouth can differ from the 95656 normal.