Junction City, OR 97409 Frost Dates
Frost dates for Junction City, OR, ZIP 97409
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 10/23, about 196 frost-free days later.
Junction City sits in USDA Zone 8b (15 to 20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 8b around Junction City has about 8 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 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/15 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Junction City compares
At roughly 196 frost-free days, Junction City places 18,949 of 40,283 ZIP codes in this dataset. Within OR, it ranks 247 of 463.
Learn more
local microclimates explains what one yard in Junction City can differ from the 97409 normal, and zone vs. frost date explains why Zone 8b and Junction City's frost date answer different questions.