Colusa, CA 95950 Frost Dates
95950, near Colusa, CA: the frost window
The last spring frost here typically falls around 02/14, about 170 days from today. Fall's first freeze usually shows up around 12/01, roughly 293 days after the last spring frost.
Colusa 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
Colusa's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
02/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/31 and only about 1 year in 10 sees frost after that.
Colusa against the rest of the dataset
At roughly 293 frost-free days, Colusa places 4,288 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,664 of 2,555.
Learn more
Two guides worth reading on 95950: local microclimates, on what one yard in Colusa can differ from the 95950 normal, and zone vs. frost date, on why Zone 9b and Colusa's frost date answer different questions.