Shoreline, WA 98113 Frost Dates
Shoreline, WA: when does the frost end?
Typically, the last spring freeze lands around 03/08, roughly 192 days out. Fall's first freeze usually shows up around 11/23, roughly 259 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Shoreline 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 12 weeks until Shoreline's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/08 isn't a guarantee
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
Shoreline's growing season runs about 259 days, ranking 6,547 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 37 of 700.
Learn more
Before leaning on 98113's figures: the frost range explains how to read the range around Shoreline's dates instead of trusting one, while local microclimates explains what one yard in Shoreline can differ from the 98113 normal.