Pleasant Hill, CA 94523 Frost Dates
Pleasant Hill, CA: when does the frost end?
Around 01/07 is the usual last spring frost, about 132 days away. Fall's first freeze usually shows up around 12/19, roughly 346 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pleasant Hill in Zone 9b (25 to 30°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 16 weeks until Pleasant Hill's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/07 isn't a guarantee
01/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/19 and only about 1 year in 10 sees frost after that.
Pleasant Hill against the rest of the dataset
About 346 days separate Pleasant Hill's last and first frost, putting it 2,425 of 40,283 ZIP codes nationally. Within CA, it ranks 1,104 of 2,555.
Learn more
Before leaning on 94523's figures: zone vs. frost date explains why Zone 9b and Pleasant Hill's frost date answer different questions, while the frost range explains how to read the range around Pleasant Hill's dates instead of trusting one.