Yacolt, WA 98603 Frost Dates
Frost dates for Yacolt, WA, ZIP 98603
The last spring frost here typically falls around 04/01, about 216 days from today. The first fall frost typically arrives around 11/18, about 227 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 Yacolt, not a forecast for this year.
What to do before the first frost
Zone 8b around Yacolt has about 12 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.
How much risk comes with planting early here
04/01 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. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Yacolt compares
At roughly 227 frost-free days, Yacolt places 11,025 of 40,283 ZIP codes in this dataset. Within WA, it ranks 207 of 700.
Learn more
the frost range explains how to read the range around Yacolt's dates instead of trusting one, and local microclimates explains what one yard in Yacolt can differ from the 98603 normal.