Adrian, OR 97901 Frost Dates
Frost dates for Adrian, OR, ZIP 97901
Around 04/24 is the usual last spring frost, about 239 days away. The first fall frost typically arrives around 10/09, about 169 frost-free days later.
Zone 7a (0 to 5°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 Adrian, not a forecast for this year.
What to do before the first frost
Zone 7a around Adrian has about 6 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 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Adrian compares
Adrian's growing season runs about 169 days, ranking 29,617 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 319 of 463.
Learn more
local microclimates explains what one yard in Adrian can differ from the 97901 normal, and zone vs. frost date explains why Zone 7a and Adrian's frost date answer different questions.