Millwood, WA 99217 Frost Dates
Millwood, WA: when does the frost end?
Around 04/26 is the usual last spring frost, about 241 days away. Fall's first freeze usually shows up around 10/15, roughly 170 days after the last spring frost.
Millwood sits in USDA Zone 6b (-5 to 0°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.
Stretching the season past the first frost
With roughly 7 weeks until Millwood's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Millwood against the rest of the dataset
Millwood's growing season runs about 170 days, ranking 29,063 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 503 of 700.
Learn more
Before leaning on 99217's figures: local microclimates explains what one yard in Millwood can differ from the 99217 normal, while zone vs. frost date explains why Zone 6b and Millwood's frost date answer different questions.