Washougal, WA 97240 Frost Dates
Washougal, WA: when does the frost end?
Typically, the last spring freeze lands around 03/16, roughly 200 days out. Fall's first freeze usually shows up around 11/20, roughly 250 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Washougal in Zone 9a (20 to 25°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 Washougal's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Washougal's last frost
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/12 and only about 1 year in 10 sees frost after that.
Washougal against the rest of the dataset
Washougal's growing season runs about 250 days, ranking 7,484 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 104 of 700.
Learn more
Before leaning on 97240's figures: local microclimates explains what one yard in Washougal can differ from the 97240 normal, while zone vs. frost date explains why Zone 9a and Washougal's frost date answer different questions.