Rohnert Park, CA 94928 Frost Dates
Rohnert Park, CA: when does the frost end?
The last spring frost here typically falls around 02/25, about 181 days from today. Fall's first freeze usually shows up around 12/01, roughly 279 days after the last spring frost.
Rohnert Park 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 14 weeks until Rohnert Park's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/25 isn't a guarantee
02/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Rohnert Park against the rest of the dataset
About 279 days separate Rohnert Park's last and first frost, putting it 4,866 of 40,283 ZIP codes nationally. Within CA, it ranks 1,786 of 2,555.
Learn more
Before leaning on 94928's figures: local microclimates explains what one yard in Rohnert Park can differ from the 94928 normal, while zone vs. frost date explains why Zone 9a and Rohnert Park's frost date answer different questions.