Athena, OR 97813 Frost Dates
Frost dates for Athena, OR, ZIP 97813
Around 03/25 is the usual last spring frost, about 209 days away. The first fall frost typically arrives around 10/29, about 218 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 Athena, not a forecast for this year.
What to do before the first frost
Zone 7a around Athena has about 9 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 03/25 isn't a guarantee
03/25 is the middle of 30 years of NOAA records, not a promise. Plant by 03/06 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 Athena compares
Athena's growing season runs about 218 days, ranking 13,302 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 180 of 463.
Learn more
local microclimates explains what one yard in Athena can differ from the 97813 normal, and zone vs. frost date explains why Zone 7a and Athena's frost date answer different questions.