Oak Harbor, WA 98278 Frost Dates
Frost dates for Oak Harbor, WA, ZIP 98278
The last spring frost here typically falls around 03/13, about 197 days from today. The first fall frost typically arrives around 11/14, about 244 frost-free days later.
Oak Harbor sits in USDA Zone 8b (15 to 20°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.
What to do before the first frost
Zone 8b around Oak Harbor has about 11 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
03/13 is the middle of 30 years of NOAA records, not a promise. Plant by 02/20 and you're betting against frost in roughly 9 years out of 10. 04/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oak Harbor compares
At roughly 244 frost-free days, Oak Harbor places 8,207 of 40,283 ZIP codes in this dataset. Within WA, it ranks 158 of 700.
Learn more
local microclimates explains what one yard in Oak Harbor can differ from the 98278 normal, and zone vs. frost date explains why Zone 8b and Oak Harbor's frost date answer different questions.