Poway, CA 92088 Frost Dates
92088, near Poway, CA: the frost window
Around 03/04 is the usual last spring frost, about 188 days away. Fall's first freeze usually shows up around 12/04, roughly 270 days after the last spring frost.
Poway 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
Poway's growing season runs out in roughly 14 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
03/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/10 and only about 1 year in 10 sees frost after that.
Poway against the rest of the dataset
At roughly 270 frost-free days, Poway places 5,515 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,935 of 2,555.
Learn more
Two guides worth reading on 92088: local microclimates, on what one yard in Poway can differ from the 92088 normal, and zone vs. frost date, on why Zone 10b and Poway's frost date answer different questions.