Poway, CA 91909 Frost Dates
When can you plant in Poway, CA?
Around 03/04 is the usual last spring frost, about 188 days away. The first fall frost typically arrives around 12/04, about 270 frost-free days later.
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.
What to do before the first frost
About 14 weeks of growing season left in Poway before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
03/04 is the middle of 30 years of NOAA records, not a promise. Plant by 01/29 and you're betting against frost in roughly 9 years out of 10. 04/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Poway compares
Poway's growing season runs about 270 days, ranking 5,483 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,903 of 2,555.
Learn more
the frost range covers how to read the range around Poway's dates instead of trusting one. local microclimates covers what one yard in Poway can differ from the 91909 normal.