Morgan Hill, CA 95157 Frost Dates
95157, near Morgan Hill, CA: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 11/18, roughly 197 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Morgan Hill, not a forecast for this year.
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.
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
Morgan Hill's growing season runs about 197 days, ranking 18,609 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,281 of 2,555.
Learn more
Two guides worth reading on 95157: zone vs. frost date, on why Zone 9b and Morgan Hill's frost date answer different questions, and the frost range, on how to read the range around Morgan Hill's dates instead of trusting one.