Port Orchard, WA 98310 Frost Dates
Frost dates for Port Orchard, WA, ZIP 98310
Typically, the last spring freeze lands around 03/29, roughly 213 days out. The first fall frost typically arrives around 11/14, about 227 frost-free days later.
Port Orchard 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 Port Orchard 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.
The actual range around Port Orchard's last frost
03/29 is the middle of 30 years of NOAA records, not a promise. Plant by 03/05 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port Orchard compares
About 227 days separate Port Orchard's last and first frost, putting it 10,967 of 40,283 ZIP codes nationally. Within WA, it ranks 190 of 700.
Learn more
local microclimates explains what one yard in Port Orchard can differ from the 98310 normal, and zone vs. frost date explains why Zone 8b and Port Orchard's frost date answer different questions.