Friday Harbor, WA 98250 Frost Dates
Frost dates for Friday Harbor, WA, ZIP 98250
Around 02/26 is the usual last spring frost, about 182 days away. The first fall frost typically arrives around 11/29, about 276 frost-free days later.
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.
What to do before the first frost
Zone 9a around Friday Harbor has about 13 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Friday Harbor's last frost
02/26 is the middle of 30 years of NOAA records, not a promise. Plant by 01/23 and you're betting against frost in roughly 9 years out of 10. 03/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Friday Harbor compares
About 276 days separate Friday Harbor's last and first frost, putting it 5,101 of 40,283 ZIP codes nationally. Within WA, it ranks 4 of 700.
Learn more
local microclimates explains what one yard in Friday Harbor can differ from the 98250 normal, and zone vs. frost date explains why Zone 9a and Friday Harbor's frost date answer different questions.