Riverbank, CA 95357 Frost Dates
Riverbank, CA: when does the frost end?
Around 01/31 is the usual last spring frost, about 156 days away. Fall's first freeze usually shows up around 12/05, roughly 312 days after the last spring frost.
Riverbank sits in USDA Zone 9b (25 to 30°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 14 weeks until Riverbank's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/31 isn't a guarantee
01/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
Riverbank against the rest of the dataset
Riverbank's growing season runs about 312 days, ranking 3,479 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,451 of 2,555.
Learn more
Before leaning on 95357's figures: zone vs. frost date explains why Zone 9b and Riverbank's frost date answer different questions, while the frost range explains how to read the range around Riverbank's dates instead of trusting one.