Half Moon Bay, CA 94019 Frost Dates
94019, near Half Moon Bay, CA: the frost window
The last spring frost here typically falls around 02/06, about 162 days from today. Fall's first freeze usually shows up around 12/17, roughly 328 days after the last spring frost.
Zone 10a (30 to 35°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 Half Moon Bay, not a forecast for this year.
Stretching the season past the first frost
Half Moon Bay's growing season runs out in roughly 16 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
02/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/17 and only about 1 year in 10 sees frost after that.
Half Moon Bay against the rest of the dataset
Half Moon Bay's growing season runs about 328 days, ranking 3,189 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,367 of 2,555.
Learn more
Two guides worth reading on 94019: the frost range, on how to read the range around Half Moon Bay's dates instead of trusting one, and local microclimates, on what one yard in Half Moon Bay can differ from the 94019 normal.