North Bonneville, WA 98639 Frost Dates
North Bonneville, WA: when does the frost end?
The last spring frost here typically falls around 03/14, about 198 days from today. Fall's first freeze usually shows up around 11/27, roughly 257 days after the last spring frost.
Zone 9a (20 to 25°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 North Bonneville, not a forecast for this year.
Stretching the season past the first frost
With roughly 13 weeks until North Bonneville'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
03/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/04 and only about 1 year in 10 sees frost after that.
North Bonneville against the rest of the dataset
About 257 days separate North Bonneville's last and first frost, putting it 6,720 of 40,283 ZIP codes nationally. Within WA, it ranks 52 of 700.
Learn more
Before leaning on 98639's figures: the frost range explains how to read the range around North Bonneville's dates instead of trusting one, while local microclimates explains what one yard in North Bonneville can differ from the 98639 normal.