Morgan Hill, CA 95101 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 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 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.
How much risk comes with planting early here
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 18,598 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,270 of 2,555.
Learn more
zone vs. frost date covers why Zone 10a and Morgan Hill's frost date answer different questions. the frost range covers how to read the range around Morgan Hill's dates instead of trusting one.