Cathlamet, WA 98647 Frost Dates
Cathlamet, WA: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/22, roughly 178 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Cathlamet in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Cathlamet's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Cathlamet against the rest of the dataset
About 178 days separate Cathlamet's last and first frost, putting it 25,862 of 40,283 ZIP codes nationally. Within WA, it ranks 452 of 700.
Learn more
Before leaning on 98647's figures: the frost range explains how to read the range around Cathlamet's dates instead of trusting one, while local microclimates explains what one yard in Cathlamet can differ from the 98647 normal.