Seattle, WA 98121 Frost Dates
98121, near Seattle, 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.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Seattle, not a forecast for this year.
Stretching the season past the first frost
Seattle'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 Seattle's last frost
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.
Seattle against the rest of the dataset
About 247 days separate Seattle's last and first frost, putting it 7,749 of 40,283 ZIP codes nationally. Within WA, it ranks 134 of 700.
Learn more
Two guides worth reading on 98121: zone vs. frost date, on why Zone 9a and Seattle's frost date answer different questions, and the frost range, on how to read the range around Seattle's dates instead of trusting one.