Scotts Mills, OR 97307 Frost Dates
97307, near Scotts Mills, OR: the frost window
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 11/04, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Scotts Mills in Zone 8b (15 to 20°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
Scotts Mills's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Scotts Mills against the rest of the dataset
Scotts Mills's growing season runs about 190 days, ranking 21,287 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 280 of 463.
Learn more
Two guides worth reading on 97307: zone vs. frost date, on why Zone 8b and Scotts Mills's frost date answer different questions, and the frost range, on how to read the range around Scotts Mills's dates instead of trusting one.