Morgan Hill, CA 94309 Frost Dates
94309, near Morgan Hill, CA: the frost window
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 9b (25 to 30°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
Morgan Hill's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Morgan Hill's last frost
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
About 197 days separate Morgan Hill's last and first frost, putting it 18,583 of 40,283 ZIP codes nationally. Within CA, it ranks 2,255 of 2,555.
Learn more
Two guides worth reading on 94309: local microclimates, on what one yard in Morgan Hill can differ from the 94309 normal, and zone vs. frost date, on why Zone 9b and Morgan Hill's frost date answer different questions.