Shoreline, WA 98133 Frost Dates
98133, near Shoreline, WA: the frost window
The last spring frost here typically falls around 03/08, about 192 days from today. Fall's first freeze usually shows up around 11/23, roughly 259 days after the last spring frost.
Shoreline 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.
Stretching the season past the first frost
Shoreline'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.
The actual range around Shoreline's last frost
03/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Shoreline against the rest of the dataset
About 259 days separate Shoreline's last and first frost, putting it 6,548 of 40,283 ZIP codes nationally. Within WA, it ranks 38 of 700.
Learn more
Two guides worth reading on 98133: the frost range, on how to read the range around Shoreline's dates instead of trusting one, and local microclimates, on what one yard in Shoreline can differ from the 98133 normal.