Greenfield, CA 93902 Frost Dates
When can you plant in Greenfield, CA?
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 11/03, about 189 frost-free days later.
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.
What to do before the first frost
About 10 weeks of growing season left in Greenfield before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Greenfield compares
Greenfield's growing season runs about 189 days, ranking 21,422 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,319 of 2,555.
Learn more
local microclimates covers what one yard in Greenfield can differ from the 93902 normal. zone vs. frost date covers why Zone 9b and Greenfield's frost date answer different questions.