Vernonia, OR 97064 Frost Dates
Vernonia, OR: when does the frost end?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. Fall's first freeze usually shows up around 10/01, roughly 144 days after the last spring frost.
Vernonia sits in USDA Zone 8a (10 to 15°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 5 weeks until Vernonia's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Vernonia against the rest of the dataset
At roughly 144 frost-free days, Vernonia places 36,369 of 40,283 ZIP codes in this dataset. Within OR, it ranks 365 of 463.
Learn more
Before leaning on 97064's figures: local microclimates explains what one yard in Vernonia can differ from the 97064 normal, while zone vs. frost date explains why Zone 8a and Vernonia's frost date answer different questions.