Bainbridge Island, WA 98061 Frost Dates
98061, near Bainbridge Island, WA: the frost window
Around 03/29 is the usual last spring frost, about 213 days away. 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
Bainbridge Island's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/29 isn't a guarantee
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
At roughly 227 frost-free days, Bainbridge Island places 10,959 of 40,283 ZIP codes in this dataset. Within WA, it ranks 187 of 700.
Learn more
Two guides worth reading on 98061: zone vs. frost date, on why Zone 9a and Bainbridge Island's frost date answer different questions, and the frost range, on how to read the range around Bainbridge Island's dates instead of trusting one.