Newcastle, WA 98006 Frost Dates
Newcastle, WA: when does the frost end?
Typically, the last spring freeze lands around 03/13, roughly 197 days out. Fall's first freeze usually shows up around 11/17, roughly 247 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Newcastle in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 12 weeks until Newcastle's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/13 isn't a guarantee
03/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/01 and only about 1 year in 10 sees frost after that.
Newcastle against the rest of the dataset
At roughly 247 frost-free days, Newcastle places 7,812 of 40,283 ZIP codes in this dataset. Within WA, it ranks 155 of 700.
Learn more
Before leaning on 98006's figures: the frost range explains how to read the range around Newcastle's dates instead of trusting one, while local microclimates explains what one yard in Newcastle can differ from the 98006 normal.