Morgan Hill, CA 95170 Frost Dates
When can you plant in Morgan Hill, CA?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. The first fall frost typically arrives around 11/18, about 197 frost-free days later.
Morgan Hill sits in USDA Zone 9b (25 to 30°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 12 weeks of growing season left in Morgan Hill before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 06/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morgan Hill compares
At roughly 197 frost-free days, Morgan Hill places 18,615 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,287 of 2,555.
Learn more
local microclimates covers what one yard in Morgan Hill can differ from the 95170 normal. zone vs. frost date covers why Zone 9b and Morgan Hill's frost date answer different questions.