Warrenton, OR 97146 Frost Dates
When can you plant in Warrenton, OR?
Typically, the last spring freeze lands around 03/30, roughly 214 days out. The first fall frost typically arrives around 11/18, about 233 frost-free days later.
Zone 9a (20 to 25°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 Warrenton, not a forecast for this year.
What to do before the first frost
About 12 weeks of growing season left in Warrenton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Warrenton's last frost
03/30 is the middle of 30 years of NOAA records, not a promise. Plant by 02/26 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Warrenton compares
At roughly 233 frost-free days, Warrenton places 9,888 of 40,283 ZIP codes in this dataset. Within OR, it ranks 135 of 463.
Learn more
local microclimates covers what one yard in Warrenton can differ from the 97146 normal. zone vs. frost date covers why Zone 9a and Warrenton's frost date answer different questions.