Portland, OR 97205 Frost Dates
When can you plant in Portland, OR?
Typically, the last spring freeze lands around 03/13, roughly 197 days out. The first fall frost typically arrives around 11/19, about 247 frost-free days later.
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 Portland, not a forecast for this year.
What to do before the first frost
About 12 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.
The actual range around Portland's last frost
03/13 is the middle of 30 years of NOAA records, not a promise. Plant by 02/22 and you're betting against frost in roughly 9 years out of 10. 04/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
At roughly 247 frost-free days, Portland places 7,757 of 40,283 ZIP codes in this dataset. Within OR, it ranks 85 of 463.
Learn more
the frost range covers how to read the range around Portland's dates instead of trusting one. local microclimates covers what one yard in Portland can differ from the 97205 normal.