Carbonado, WA 98411 Frost Dates
Frost dates for Carbonado, WA, ZIP 98411
Around 04/11 is the usual last spring frost, about 226 days away. The first fall frost typically arrives around 10/30, about 202 frost-free days later.
Carbonado 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 Carbonado has about 9 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 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Carbonado compares
About 202 days separate Carbonado's last and first frost, putting it 17,302 of 40,283 ZIP codes nationally. Within WA, it ranks 303 of 700.
Learn more
the frost range explains how to read the range around Carbonado's dates instead of trusting one, and local microclimates explains what one yard in Carbonado can differ from the 98411 normal.