Portland, OR 97211 Frost Dates
97211, near Portland, OR: the frost window
The last spring frost here typically falls around 03/13, about 197 days from today. Fall's first freeze usually shows up around 11/19, roughly 247 days after the last spring frost.
Portland sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Portland'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 Portland's last frost
03/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/01 and only about 1 year in 10 sees frost after that.
Portland against the rest of the dataset
About 247 days separate Portland's last and first frost, putting it 7,759 of 40,283 ZIP codes nationally. Within OR, it ranks 87 of 463.
Learn more
Two guides worth reading on 97211: local microclimates, on what one yard in Portland can differ from the 97211 normal, and zone vs. frost date, on why Zone 9a and Portland's frost date answer different questions.