Bainbridge Island, WA 98311 Frost Dates
Bainbridge Island, WA: when does the frost end?
The last spring frost here typically falls around 03/29, about 213 days from today. Fall's first freeze usually shows up around 11/14, roughly 227 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 Bainbridge Island, not a forecast for this year.
Stretching the season past the first frost
With roughly 11 weeks until Bainbridge Island's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Bainbridge Island's last frost
03/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Bainbridge Island against the rest of the dataset
About 227 days separate Bainbridge Island's last and first frost, putting it 10,961 of 40,283 ZIP codes nationally. Within WA, it ranks 189 of 700.
Learn more
Before leaning on 98311's figures: zone vs. frost date explains why Zone 9a and Bainbridge Island's frost date answer different questions, while the frost range explains how to read the range around Bainbridge Island's dates instead of trusting one.