Ilwaco, WA 98644 Frost Dates
Frost dates for Ilwaco, WA, ZIP 98644
The last spring frost here typically falls around 04/06, about 221 days from today. The first fall frost typically arrives around 10/26, about 200 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ilwaco in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9a around Ilwaco 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 04/06 isn't a guarantee
04/06 is the middle of 30 years of NOAA records, not a promise. Plant by 03/16 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ilwaco compares
Ilwaco's growing season runs about 200 days, ranking 17,853 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 331 of 700.
Learn more
local microclimates explains what one yard in Ilwaco can differ from the 98644 normal, and zone vs. frost date explains why Zone 9a and Ilwaco's frost date answer different questions.