Lowell, OR 97452 Frost Dates
Lowell, OR: when does the frost end?
Around 04/03 is the usual last spring frost, about 218 days away. Fall's first freeze usually shows up around 11/11, roughly 220 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 Lowell, not a forecast for this year.
Stretching the season past the first frost
With roughly 11 weeks until Lowell's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/03 isn't a guarantee
04/03 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 05/02 and only about 1 year in 10 sees frost after that.
Lowell against the rest of the dataset
Lowell's growing season runs about 220 days, ranking 12,848 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 176 of 463.
Learn more
Before leaning on 97452's figures: local microclimates explains what one yard in Lowell can differ from the 97452 normal, while zone vs. frost date explains why Zone 9a and Lowell's frost date answer different questions.