Troutdale, OR 97060 Frost Dates
Troutdale, OR: when does the frost end?
Around 03/16 is the usual last spring frost, about 200 days away. Fall's first freeze usually shows up around 11/20, roughly 250 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Troutdale in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 12 weeks until Troutdale'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
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/12 and only about 1 year in 10 sees frost after that.
Troutdale against the rest of the dataset
Troutdale's growing season runs about 250 days, ranking 7,498 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 70 of 463.
Learn more
Before leaning on 97060's figures: the frost range explains how to read the range around Troutdale's dates instead of trusting one, while local microclimates explains what one yard in Troutdale can differ from the 97060 normal.