Dallas, OR 97371 Frost Dates
Dallas, OR: when does the frost end?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 11/01, roughly 199 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 Dallas, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Dallas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Dallas against the rest of the dataset
Dallas's growing season runs about 199 days, ranking 18,042 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 234 of 463.
Learn more
Before leaning on 97371's figures: the frost range explains how to read the range around Dallas's dates instead of trusting one, while local microclimates explains what one yard in Dallas can differ from the 97371 normal.