DuPont, WA 98433 Frost Dates
DuPont, WA: when does the frost end?
Around 03/11 is the usual last spring frost, about 195 days away. Fall's first freeze usually shows up around 11/21, roughly 254 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts DuPont in Zone 8b (15 to 20°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 DuPont's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
03/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
DuPont against the rest of the dataset
DuPont's growing season runs about 254 days, ranking 7,020 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 68 of 700.
Learn more
Before leaning on 98433's figures: the frost range explains how to read the range around DuPont's dates instead of trusting one, while local microclimates explains what one yard in DuPont can differ from the 98433 normal.