Friday Harbor, WA 98286 Frost Dates
Friday Harbor, WA: when does the frost end?
Typically, the last spring freeze lands around 02/26, roughly 182 days out. Fall's first freeze usually shows up around 11/29, roughly 276 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Friday Harbor in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 13 weeks until Friday Harbor's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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
Friday Harbor's growing season runs about 276 days, ranking 5,105 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 8 of 700.
Learn more
Before leaning on 98286's figures: zone vs. frost date explains why Zone 9a and Friday Harbor's frost date answer different questions, while the frost range explains how to read the range around Friday Harbor's dates instead of trusting one.