Beaverton, OR 97225 Frost Dates
When can you plant in Beaverton, OR?
Around 02/11 is the usual last spring frost, about 167 days away. The first fall frost typically arrives around 12/05, about 303 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 Beaverton, not a forecast for this year.
What to do before the first frost
About 14 weeks of growing season left in Beaverton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 02/11 isn't a guarantee
02/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/05 and you're betting against frost in roughly 9 years out of 10. 12/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Beaverton compares
Beaverton's growing season runs about 303 days, ranking 3,774 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 21 of 463.
Learn more
local microclimates covers what one yard in Beaverton can differ from the 97225 normal. zone vs. frost date covers why Zone 8b and Beaverton's frost date answer different questions.