Poulsbo, WA 98364 Frost Dates
When can you plant in Poulsbo, WA?
Typically, the last spring freeze lands around 03/09, roughly 193 days out. The first fall frost typically arrives around 11/17, about 250 frost-free days later.
Poulsbo sits in USDA Zone 9a (20 to 25°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 12 weeks of growing season left in Poulsbo before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/09 isn't a guarantee
03/09 is the middle of 30 years of NOAA records, not a promise. Plant by 02/15 and you're betting against frost in roughly 9 years out of 10. 03/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Poulsbo compares
About 250 days separate Poulsbo's last and first frost, putting it 7,503 of 40,283 ZIP codes nationally. Within WA, it ranks 118 of 700.
Learn more
zone vs. frost date covers why Zone 9a and Poulsbo's frost date answer different questions. the frost range covers how to read the range around Poulsbo's dates instead of trusting one.