Corvallis, OR 97331 Frost Dates
Corvallis, OR: when does the frost end?
The last spring frost here typically falls around 04/17, about 232 days from today. Fall's first freeze usually shows up around 10/28, roughly 194 days after the last spring frost.
Zone 8b (15 to 20°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 Corvallis, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Corvallis's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Corvallis against the rest of the dataset
About 194 days separate Corvallis's last and first frost, putting it 19,415 of 40,283 ZIP codes nationally. Within OR, it ranks 256 of 463.
Learn more
Before leaning on 97331's figures: local microclimates explains what one yard in Corvallis can differ from the 97331 normal, while zone vs. frost date explains why Zone 8b and Corvallis's frost date answer different questions.