Beaverton, OR 97008 Frost Dates
97008, near Beaverton, OR: the frost window
Typically, the last spring freeze lands around 02/11, roughly 167 days out. Fall's first freeze usually shows up around 12/05, roughly 303 days after the last spring frost.
Beaverton sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Beaverton's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
02/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/26 and only about 1 year in 10 sees frost after that.
Beaverton against the rest of the dataset
About 303 days separate Beaverton's last and first frost, putting it 3,772 of 40,283 ZIP codes nationally. Within OR, it ranks 19 of 463.
Learn more
Two guides worth reading on 97008: the frost range, on how to read the range around Beaverton's dates instead of trusting one, and local microclimates, on what one yard in Beaverton can differ from the 97008 normal.