Ripon, CA 95368 Frost Dates
Ripon, CA: when does the frost end?
Typically, the last spring freeze lands around 01/31, roughly 156 days out. Fall's first freeze usually shows up around 12/05, roughly 312 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ripon 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 14 weeks until Ripon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Ripon's last frost
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.
Ripon against the rest of the dataset
At roughly 312 frost-free days, Ripon places 3,491 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,457 of 2,555.
Learn more
Before leaning on 95368's figures: zone vs. frost date explains why Zone 9b and Ripon's frost date answer different questions, while the frost range explains how to read the range around Ripon's dates instead of trusting one.