Friday Harbor, WA 98297 Frost Dates
98297, near Friday Harbor, WA: the frost window
Around 02/26 is the usual last spring frost, about 182 days away. Fall's first freeze usually shows up around 11/29, roughly 276 days after the last spring frost.
Friday Harbor 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
Friday Harbor's growing season runs out in roughly 13 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 02/26 isn't a guarantee
02/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/23 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.
Friday Harbor against the rest of the dataset
About 276 days separate Friday Harbor's last and first frost, putting it 5,106 of 40,283 ZIP codes nationally. Within WA, it ranks 9 of 700.
Learn more
Two guides worth reading on 98297: the frost range, on how to read the range around Friday Harbor's dates instead of trusting one, and local microclimates, on what one yard in Friday Harbor can differ from the 98297 normal.