Winston, OR 97481 Frost Dates
Frost dates for Winston, OR, ZIP 97481
Typically, the last spring freeze lands around 03/23, roughly 207 days out. The first fall frost typically arrives around 11/18, about 237 frost-free days later.
The USDA Plant Hardiness Zone Map puts Winston 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 Winston has about 12 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 03/23 isn't a guarantee
03/23 is the middle of 30 years of NOAA records, not a promise. Plant by 02/25 and you're betting against frost in roughly 9 years out of 10. 04/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Winston compares
At roughly 237 frost-free days, Winston places 9,101 of 40,283 ZIP codes in this dataset. Within OR, it ranks 128 of 463.
Learn more
local microclimates explains what one yard in Winston can differ from the 97481 normal, and zone vs. frost date explains why Zone 9a and Winston's frost date answer different questions.