Greenfield, CA 93942 Frost Dates
When can you plant in Greenfield, CA?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 11/03, about 189 frost-free days later.
Greenfield sits in USDA Zone 10a (30 to 35°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.
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.
Why 04/23 isn't a guarantee
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 21,425 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,322 of 2,555.
Learn more
zone vs. frost date covers why Zone 10a and Greenfield's frost date answer different questions. the frost range covers how to read the range around Greenfield's dates instead of trusting one.