Port Townsend, WA 98325 Frost Dates
Port Townsend, WA: when does the frost end?
Around 03/01 is the usual last spring frost, about 185 days away. Fall's first freeze usually shows up around 11/28, roughly 274 days after the last spring frost.
Zone 8b (15 to 20°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 Townsend, not a forecast for this year.
Stretching the season past the first frost
With roughly 13 weeks until Port Townsend's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Port Townsend's last frost
03/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/23 and only about 1 year in 10 sees frost after that.
Port Townsend against the rest of the dataset
About 274 days separate Port Townsend's last and first frost, putting it 5,151 of 40,283 ZIP codes nationally. Within WA, it ranks 11 of 700.
Learn more
Before leaning on 98325's figures: local microclimates explains what one yard in Port Townsend can differ from the 98325 normal, while zone vs. frost date explains why Zone 8b and Port Townsend's frost date answer different questions.