Oroville, CA 95966 Frost Dates
95966, near Oroville, CA: the frost window
Around 01/29 is the usual last spring frost, about 154 days away. Fall's first freeze usually shows up around 12/07, roughly 317 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oroville 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
Oroville's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
01/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/28 and only about 1 year in 10 sees frost after that.
Oroville against the rest of the dataset
At roughly 317 frost-free days, Oroville places 3,374 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,406 of 2,555.
Learn more
Two guides worth reading on 95966: the frost range, on how to read the range around Oroville's dates instead of trusting one, and local microclimates, on what one yard in Oroville can differ from the 95966 normal.