Burien, WA 98136 Frost Dates
Frost dates for Burien, WA, ZIP 98136
Around 03/13 is the usual last spring frost, about 197 days away. The first fall frost typically arrives around 11/17, about 247 frost-free days later.
Burien sits in USDA Zone 9a (20 to 25°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 9a around Burien has about 12 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 Burien compares
About 247 days separate Burien's last and first frost, putting it 7,778 of 40,283 ZIP codes nationally. Within WA, it ranks 146 of 700.
Learn more
the frost range explains how to read the range around Burien's dates instead of trusting one, and local microclimates explains what one yard in Burien can differ from the 98136 normal.