Poway, CA 92187 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 5,546 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,966 of 2,555.
Learn more
Before leaning on 92187's figures: the frost range explains how to read the range around Poway's dates instead of trusting one, while local microclimates explains what one yard in Poway can differ from the 92187 normal.