Greenfield, CA 93912 Frost Dates
93912, near Greenfield, CA: the frost window
The last spring frost here typically falls around 04/23, about 238 days from today. Fall's first freeze usually shows up around 11/03, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Greenfield 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
Greenfield'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.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Greenfield against the rest of the dataset
Greenfield's growing season runs about 189 days, ranking 21,423 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,320 of 2,555.
Learn more
Two guides worth reading on 93912: 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 93912 normal.