Lomita, CA 90509 Frost Dates
90509, near Lomita, CA: the frost window
The last spring frost here typically falls around 01/09, about 134 days from today. Fall's first freeze usually shows up around 01/05, roughly 365 days after the last spring frost.
Lomita sits in USDA Zone 10b (35 to 40°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Lomita's growing season runs out in roughly 19 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
01/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/04 and only about 1 year in 10 sees frost after that.
Lomita against the rest of the dataset
At roughly 365 frost-free days, Lomita places 1,323 of 40,283 ZIP codes in this dataset. Within CA, it ranks 608 of 2,555.
Learn more
Two guides worth reading on 90509: the frost range, on how to read the range around Lomita's dates instead of trusting one, and local microclimates, on what one yard in Lomita can differ from the 90509 normal.