Oregon City, OR 97045 Frost Dates
Frost dates for Oregon City, OR, ZIP 97045
Typically, the last spring freeze lands around 03/16, roughly 200 days out. The first fall frost typically arrives around 11/14, about 242 frost-free days later.
The USDA Plant Hardiness Zone Map puts Oregon City in Zone 9a (20 to 25°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 9a around Oregon City has about 11 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.
The actual range around Oregon City's last frost
03/16 is the middle of 30 years of NOAA records, not a promise. Plant by 02/21 and you're betting against frost in roughly 9 years out of 10. 04/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oregon City compares
About 242 days separate Oregon City's last and first frost, putting it 8,345 of 40,283 ZIP codes nationally. Within OR, it ranks 107 of 463.
Learn more
local microclimates explains what one yard in Oregon City can differ from the 97045 normal, and zone vs. frost date explains why Zone 9a and Oregon City's frost date answer different questions.