Westport, WA 98547 Frost Dates
Westport, WA: when does the frost end?
Typically, the last spring freeze lands around 03/29, roughly 213 days out. Fall's first freeze usually shows up around 11/07, roughly 224 days after the last spring frost.
Westport sits in USDA Zone 9a (20 to 25°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 10 weeks until Westport's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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 02/28 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.
Westport against the rest of the dataset
Westport's growing season runs about 224 days, ranking 11,896 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 217 of 700.
Learn more
Before leaning on 98547's figures: zone vs. frost date explains why Zone 9a and Westport's frost date answer different questions, while the frost range explains how to read the range around Westport's dates instead of trusting one.