Poway, CA 92147 Frost Dates
Poway, CA: when does the frost end?
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.
Zone 11a (40 to 45°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 Poway, not a forecast for this year.
Stretching the season past the first frost
With roughly 14 weeks until Poway's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/04 isn't a guarantee
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 5,524 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,944 of 2,555.
Learn more
Before leaning on 92147's figures: local microclimates explains what one yard in Poway can differ from the 92147 normal, while zone vs. frost date explains why Zone 11a and Poway's frost date answer different questions.