Morgan Hill, CA 95109 Frost Dates
When can you plant in Morgan Hill, CA?
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 11/18, about 197 frost-free days later.
The USDA Plant Hardiness Zone Map puts Morgan Hill 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 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
Morgan Hill's growing season runs about 197 days, ranking 18,602 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,274 of 2,555.
Learn more
the frost range covers how to read the range around Morgan Hill's dates instead of trusting one. local microclimates covers what one yard in Morgan Hill can differ from the 95109 normal.