Willamina, OR 97347 Frost Dates
Willamina, OR: when does the frost end?
Typically, the last spring freeze lands around 04/04, roughly 219 days out. Fall's first freeze usually shows up around 11/16, roughly 227 days after the last spring frost.
Willamina sits in USDA Zone 8b (15 to 20°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
With roughly 11 weeks until Willamina's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Willamina against the rest of the dataset
About 227 days separate Willamina's last and first frost, putting it 11,019 of 40,283 ZIP codes nationally. Within OR, it ranks 151 of 463.
Learn more
Before leaning on 97347's figures: the frost range explains how to read the range around Willamina's dates instead of trusting one, while local microclimates explains what one yard in Willamina can differ from the 97347 normal.