Port Townsend, WA 98368 Frost Dates
Frost dates for Port Townsend, WA, ZIP 98368
Typically, the last spring freeze lands around 03/01, roughly 185 days out. The first fall frost typically arrives around 11/28, about 274 frost-free days later.
The USDA Plant Hardiness Zone Map puts Port Townsend in Zone 8b (15 to 20°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 8b around Port Townsend 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 Port Townsend's last frost
03/01 is the middle of 30 years of NOAA records, not a promise. Plant by 02/03 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 Port Townsend compares
About 274 days separate Port Townsend's last and first frost, putting it 5,154 of 40,283 ZIP codes nationally. Within WA, it ranks 14 of 700.
Learn more
zone vs. frost date explains why Zone 8b and Port Townsend's frost date answer different questions, and the frost range explains how to read the range around Port Townsend's dates instead of trusting one.