Suisun City, CA 94535 Frost Dates
94535, near Suisun City, CA: the frost window
The last spring frost here typically falls around 02/18, about 174 days from today. Fall's first freeze usually shows up around 11/28, roughly 283 days after the last spring frost.
Suisun City 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
Suisun City's growing season runs out in roughly 13 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Suisun City's last frost
02/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/25 and only about 1 year in 10 sees frost after that.
Suisun City against the rest of the dataset
Suisun City's growing season runs about 283 days, ranking 4,734 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,744 of 2,555.
Learn more
Two guides worth reading on 94535: the frost range, on how to read the range around Suisun City's dates instead of trusting one, and local microclimates, on what one yard in Suisun City can differ from the 94535 normal.