Portland, OR 97210 Frost Dates
Frost dates for Portland, OR, ZIP 97210
The last spring frost here typically falls around 03/29, about 213 days from today. The first fall frost typically arrives around 11/09, about 223 frost-free days later.
The USDA Plant Hardiness Zone Map puts Portland in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 8b around Portland has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/29 isn't a guarantee
03/29 is the middle of 30 years of NOAA records, not a promise. Plant by 03/06 and you're betting against frost in roughly 9 years out of 10. 04/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
About 223 days separate Portland's last and first frost, putting it 11,988 of 40,283 ZIP codes nationally. Within OR, it ranks 159 of 463.
Learn more
the frost range explains how to read the range around Portland's dates instead of trusting one, and local microclimates explains what one yard in Portland can differ from the 97210 normal.