Wilbur, WA 99185 Frost Dates
Wilbur, WA: when does the frost end?
Around 06/01 is the usual last spring frost, about 277 days away. Fall's first freeze usually shows up around 09/22, roughly 112 days after the last spring frost.
Zone 6b (-5 to 0°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 Wilbur, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Wilbur'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
06/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/22 and only about 1 year in 10 sees frost after that.
Wilbur against the rest of the dataset
Wilbur's growing season runs about 112 days, ranking 39,428 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 670 of 700.
Learn more
Before leaning on 99185's figures: local microclimates explains what one yard in Wilbur can differ from the 99185 normal, while zone vs. frost date explains why Zone 6b and Wilbur's frost date answer different questions.