Poulsbo, WA 98345 Frost Dates
Poulsbo, WA: when does the frost end?
Typically, the last spring freeze lands around 03/29, roughly 213 days out. Fall's first freeze usually shows up around 11/14, roughly 227 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Poulsbo in Zone 9a (20 to 25°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 11 weeks until Poulsbo's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/29 isn't a guarantee
03/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Poulsbo against the rest of the dataset
Poulsbo's growing season runs about 227 days, ranking 10,981 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 201 of 700.
Learn more
Before leaning on 98345's figures: local microclimates explains what one yard in Poulsbo can differ from the 98345 normal, while zone vs. frost date explains why Zone 9a and Poulsbo's frost date answer different questions.