Portland, OR 97201 Frost Dates
When can you plant in Portland, OR?
Around 02/11 is the usual last spring frost, about 167 days away. The first fall frost typically arrives around 12/05, about 303 frost-free days later.
Portland sits in USDA Zone 8b (15 to 20°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.
What to do before the first frost
About 14 weeks of growing season left in Portland before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
02/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/05 and you're betting against frost in roughly 9 years out of 10. 12/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
At roughly 303 frost-free days, Portland places 3,765 of 40,283 ZIP codes in this dataset. Within OR, it ranks 12 of 463.
Learn more
zone vs. frost date covers why Zone 8b and Portland's frost date answer different questions. the frost range covers how to read the range around Portland's dates instead of trusting one.