Greenfield, CA 93927 Frost Dates
93927, near Greenfield, CA: the frost window
The last spring frost here typically falls around 02/23, about 179 days from today. Fall's first freeze usually shows up around 11/22, roughly 271 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Greenfield, not a forecast for this year.
Stretching the season past the first frost
Greenfield'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.
How much risk comes with planting early here
02/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/19 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.
Greenfield against the rest of the dataset
About 271 days separate Greenfield's last and first frost, putting it 5,423 of 40,283 ZIP codes nationally. Within CA, it ranks 1,879 of 2,555.
Learn more
Two guides worth reading on 93927: the frost range, on how to read the range around Greenfield's dates instead of trusting one, and local microclimates, on what one yard in Greenfield can differ from the 93927 normal.