Friday Harbor, WA 98243 Frost Dates
Frost dates for Friday Harbor, WA, ZIP 98243
Typically, the last spring freeze lands around 02/26, roughly 182 days out. The first fall frost typically arrives around 11/29, about 276 frost-free days later.
Zone 9a (20 to 25°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 Friday Harbor, not a forecast for this year.
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.
How much risk comes with planting early here
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
Friday Harbor's growing season runs about 276 days, ranking 5,099 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 2 of 700.
Learn more
the frost range explains how to read the range around Friday Harbor's dates instead of trusting one, and local microclimates explains what one yard in Friday Harbor can differ from the 98243 normal.