Carbonado, WA 98397 Frost Dates
Carbonado, WA: when does the frost end?
Around 04/11 is the usual last spring frost, about 226 days away. Fall's first freeze usually shows up around 10/30, roughly 202 days after the last spring frost.
Carbonado sits in USDA Zone 7b (5 to 10°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.
Stretching the season past the first frost
With roughly 9 weeks until Carbonado's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Carbonado against the rest of the dataset
About 202 days separate Carbonado's last and first frost, putting it 17,300 of 40,283 ZIP codes nationally. Within WA, it ranks 301 of 700.
Learn more
Before leaning on 98397's figures: local microclimates explains what one yard in Carbonado can differ from the 98397 normal, while zone vs. frost date explains why Zone 7b and Carbonado's frost date answer different questions.