Poulsbo, WA 98383 Frost Dates
98383, near Poulsbo, WA: the frost window
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 8b (15 to 20°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
Poulsbo's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
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 10,985 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 205 of 700.
Learn more
Two guides worth reading on 98383: zone vs. frost date, on why Zone 8b and Poulsbo's frost date answer different questions, and the frost range, on how to read the range around Poulsbo's dates instead of trusting one.