Colfax, CA 95631 Frost Dates
95631, near Colfax, CA: the frost window
The last spring frost here typically falls around 04/12, about 227 days from today. Fall's first freeze usually shows up around 11/21, roughly 221 days after the last spring frost.
Colfax 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
Colfax'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.
Why 04/12 isn't a guarantee
04/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Colfax against the rest of the dataset
Colfax's growing season runs about 221 days, ranking 12,525 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,180 of 2,555.
Learn more
Two guides worth reading on 95631: local microclimates, on what one yard in Colfax can differ from the 95631 normal, and zone vs. frost date, on why Zone 9a and Colfax's frost date answer different questions.