Bellevue, WA 98005 Frost Dates
Frost dates for Bellevue, WA, ZIP 98005
Around 03/08 is the usual last spring frost, about 192 days away. The first fall frost typically arrives around 11/23, about 259 frost-free days later.
The USDA Plant Hardiness Zone Map puts Bellevue in Zone 9a (20 to 25°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 9a around Bellevue 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.
Why 03/08 isn't a guarantee
03/08 is the middle of 30 years of NOAA records, not a promise. Plant by 02/13 and you're betting against frost in roughly 9 years out of 10. 03/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bellevue compares
About 259 days separate Bellevue's last and first frost, putting it 6,526 of 40,283 ZIP codes nationally. Within WA, it ranks 29 of 700.
Learn more
zone vs. frost date explains why Zone 9a and Bellevue's frost date answer different questions, and the frost range explains how to read the range around Bellevue's dates instead of trusting one.