Oroville, CA 95919 Frost Dates
Oroville, CA: when does the frost end?
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/30, roughly 174 days after the last spring frost.
Oroville sits in USDA Zone 9a (20 to 25°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.
Stretching the season past the first frost
With roughly 9 weeks until Oroville'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
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Oroville against the rest of the dataset
At roughly 174 frost-free days, Oroville places 27,369 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,364 of 2,555.
Learn more
Before leaning on 95919's figures: zone vs. frost date explains why Zone 9a and Oroville's frost date answer different questions, while the frost range explains how to read the range around Oroville's dates instead of trusting one.