Sweet Home, OR 97345 Frost Dates
97345, near Sweet Home, OR: the frost window
Typically, the last spring freeze lands around 03/14, roughly 198 days out. Fall's first freeze usually shows up around 11/18, roughly 248 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 Sweet Home, not a forecast for this year.
Stretching the season past the first frost
Sweet Home's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Sweet Home's last frost
03/14 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 04/14 and only about 1 year in 10 sees frost after that.
Sweet Home against the rest of the dataset
At roughly 248 frost-free days, Sweet Home places 7,685 of 40,283 ZIP codes in this dataset. Within OR, it ranks 78 of 463.
Learn more
Two guides worth reading on 97345: zone vs. frost date, on why Zone 8b and Sweet Home's frost date answer different questions, and the frost range, on how to read the range around Sweet Home's dates instead of trusting one.