Lebanon, OR 97355 Frost Dates
97355, near Lebanon, OR: the frost window
The last spring frost here typically falls around 03/14, about 198 days from today. 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 Lebanon, not a forecast for this year.
Stretching the season past the first frost
Lebanon'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 Lebanon'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.
Lebanon against the rest of the dataset
Lebanon's growing season runs about 248 days, ranking 7,680 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 77 of 463.
Learn more
Two guides worth reading on 97355: local microclimates, on what one yard in Lebanon can differ from the 97355 normal, and zone vs. frost date, on why Zone 8b and Lebanon's frost date answer different questions.