Ukiah, CA 95418 Frost Dates
95418, near Ukiah, CA: the frost window
Typically, the last spring freeze lands around 03/19, roughly 203 days out. Fall's first freeze usually shows up around 11/20, roughly 245 days after the last spring frost.
Ukiah 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
Ukiah's growing season runs out in roughly 12 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 Ukiah's last frost
03/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Ukiah against the rest of the dataset
Ukiah's growing season runs about 245 days, ranking 7,996 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,101 of 2,555.
Learn more
Two guides worth reading on 95418: local microclimates, on what one yard in Ukiah can differ from the 95418 normal, and zone vs. frost date, on why Zone 9a and Ukiah's frost date answer different questions.