Seattle, WA 98164 Frost Dates
When can you plant in Seattle, WA?
The last spring frost here typically falls around 03/13, about 197 days from today. The first fall frost typically arrives around 11/17, about 247 frost-free days later.
The USDA Plant Hardiness Zone Map puts Seattle in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 12 weeks of growing season left in Seattle before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Seattle's last frost
03/13 is the middle of 30 years of NOAA records, not a promise. Plant by 02/20 and you're betting against frost in roughly 9 years out of 10. 04/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Seattle compares
At roughly 247 frost-free days, Seattle places 7,754 of 40,283 ZIP codes in this dataset. Within WA, it ranks 139 of 700.
Learn more
zone vs. frost date covers why Zone 9a and Seattle's frost date answer different questions. the frost range covers how to read the range around Seattle's dates instead of trusting one.