Sweet Home, OR 97329 Frost Dates
Sweet Home, OR: when does the frost end?
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/10, roughly 159 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sweet Home 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
With roughly 6 weeks until Sweet Home's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Sweet Home's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Sweet Home against the rest of the dataset
At roughly 159 frost-free days, Sweet Home places 32,623 of 40,283 ZIP codes in this dataset. Within OR, it ranks 340 of 463.
Learn more
Before leaning on 97329's figures: zone vs. frost date explains why Zone 8b and Sweet Home's frost date answer different questions, while the frost range explains how to read the range around Sweet Home's dates instead of trusting one.