Bothell, WA 98011 Frost Dates
Bothell, WA: when does the frost end?
Around 03/08 is the usual last spring frost, about 192 days away. Fall's first freeze usually shows up around 11/23, roughly 259 days after the last spring frost.
Bothell sits in USDA Zone 8b (15 to 20°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 12 weeks until Bothell'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
03/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/29 and only about 1 year in 10 sees frost after that.
Bothell against the rest of the dataset
About 259 days separate Bothell's last and first frost, putting it 6,552 of 40,283 ZIP codes nationally. Within WA, it ranks 40 of 700.
Learn more
Before leaning on 98011's figures: zone vs. frost date explains why Zone 8b and Bothell's frost date answer different questions, while the frost range explains how to read the range around Bothell's dates instead of trusting one.