Snohomish, WA 98291 Frost Dates
98291, near Snohomish, WA: the frost window
The last spring frost here typically falls around 04/17, about 232 days from today. Fall's first freeze usually shows up around 10/23, roughly 188 days after the last spring frost.
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.
Stretching the season past the first frost
Snohomish's growing season runs out in roughly 8 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 Snohomish's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Snohomish against the rest of the dataset
Snohomish's growing season runs about 188 days, ranking 21,924 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 411 of 700.
Learn more
Two guides worth reading on 98291: the frost range, on how to read the range around Snohomish's dates instead of trusting one, and local microclimates, on what one yard in Snohomish can differ from the 98291 normal.