Poway, CA 91951 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.
The USDA Plant Hardiness Zone Map puts Poway in Zone 10b (35 to 40°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
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
About 270 days separate Poway's last and first frost, putting it 5,490 of 40,283 ZIP codes nationally. Within CA, it ranks 1,910 of 2,555.
Learn more
Before leaning on 91951's figures: zone vs. frost date explains why Zone 10b and Poway's frost date answer different questions, while the frost range explains how to read the range around Poway's dates instead of trusting one.