Colfax, CA 95604 Frost Dates
95604, near Colfax, CA: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 11/04, roughly 183 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Colfax in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Colfax's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Colfax against the rest of the dataset
At roughly 183 frost-free days, Colfax places 23,877 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,336 of 2,555.
Learn more
Two guides worth reading on 95604: the frost range, on how to read the range around Colfax's dates instead of trusting one, and local microclimates, on what one yard in Colfax can differ from the 95604 normal.