Port Orchard, WA 98337 Frost Dates
98337, near Port Orchard, WA: the frost window
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 Port Orchard, not a forecast for this year.
Stretching the season past the first frost
Port Orchard'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.
How much risk comes with planting early here
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.
Port Orchard against the rest of the dataset
At roughly 227 frost-free days, Port Orchard places 10,968 of 40,283 ZIP codes in this dataset. Within WA, it ranks 191 of 700.
Learn more
Two guides worth reading on 98337: zone vs. frost date, on why Zone 9a and Port Orchard's frost date answer different questions, and the frost range, on how to read the range around Port Orchard's dates instead of trusting one.