Burien, WA 98106 Frost Dates
98106, near Burien, WA: the frost window
The last spring frost here typically falls around 03/13, about 197 days from today. Fall's first freeze usually shows up around 11/17, roughly 247 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Burien 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
Burien's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/13 isn't a guarantee
03/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/01 and only about 1 year in 10 sees frost after that.
Burien against the rest of the dataset
About 247 days separate Burien's last and first frost, putting it 7,776 of 40,283 ZIP codes nationally. Within WA, it ranks 144 of 700.
Learn more
Two guides worth reading on 98106: the frost range, on how to read the range around Burien's dates instead of trusting one, and local microclimates, on what one yard in Burien can differ from the 98106 normal.