Morgan Hill, CA 94039 Frost Dates
Morgan Hill, CA: when does the frost end?
The last spring frost here typically falls around 05/03, about 248 days from today. Fall's first freeze usually shows up around 11/18, roughly 197 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Morgan Hill in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 12 weeks until Morgan Hill's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Morgan Hill against the rest of the dataset
At roughly 197 frost-free days, Morgan Hill places 18,579 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,251 of 2,555.
Learn more
Before leaning on 94039's figures: zone vs. frost date explains why Zone 10a and Morgan Hill's frost date answer different questions, while the frost range explains how to read the range around Morgan Hill's dates instead of trusting one.