Snohomish, WA 98290 Frost Dates
When can you plant in Snohomish, WA?
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/23, about 188 frost-free days later.
Zone 8b (15 to 20°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 Snohomish, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Snohomish before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Snohomish compares
About 188 days separate Snohomish's last and first frost, putting it 21,923 of 40,283 ZIP codes nationally. Within WA, it ranks 410 of 700.
Learn more
local microclimates covers what one yard in Snohomish can differ from the 98290 normal. zone vs. frost date covers why Zone 8b and Snohomish's frost date answer different questions.