Washougal, WA 97228 Frost Dates
97228, near Washougal, WA: the frost window
The last spring frost here typically falls around 03/16, about 200 days from today. Fall's first freeze usually shows up around 11/20, roughly 250 days after the last spring frost.
Zone 9a (20 to 25°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 Washougal, not a forecast for this year.
Stretching the season past the first frost
Washougal's growing season runs out in roughly 12 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 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
At roughly 250 frost-free days, Washougal places 7,482 of 40,283 ZIP codes in this dataset. Within WA, it ranks 102 of 700.
Learn more
Two guides worth reading on 97228: zone vs. frost date, on why Zone 9a and Washougal's frost date answer different questions, and the frost range, on how to read the range around Washougal's dates instead of trusting one.