Roslyn, WA 98940 Frost Dates
Roslyn, WA: when does the frost end?
Around 05/09 is the usual last spring frost, about 254 days away. Fall's first freeze usually shows up around 10/06, roughly 151 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Roslyn in Zone 7a (0 to 5°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 6 weeks until Roslyn's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Roslyn against the rest of the dataset
Roslyn's growing season runs about 151 days, ranking 35,097 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 600 of 700.
Learn more
Before leaning on 98940's figures: local microclimates explains what one yard in Roslyn can differ from the 98940 normal, while zone vs. frost date explains why Zone 7a and Roslyn's frost date answer different questions.