Yoncalla, OR 97499 Frost Dates
Frost dates for Yoncalla, OR, ZIP 97499
Typically, the last spring freeze lands around 04/16, roughly 231 days out. The first fall frost typically arrives around 10/25, about 193 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 Yoncalla, not a forecast for this year.
What to do before the first frost
Zone 8b around Yoncalla 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 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Yoncalla compares
Yoncalla's growing season runs about 193 days, ranking 19,994 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 263 of 463.
Learn more
local microclimates explains what one yard in Yoncalla can differ from the 97499 normal, and zone vs. frost date explains why Zone 8b and Yoncalla's frost date answer different questions.