Republic, WA 99166 Frost Dates
Republic, WA: when does the frost end?
Typically, the last spring freeze lands around 05/30, roughly 275 days out. Fall's first freeze usually shows up around 09/10, roughly 102 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Republic, not a forecast for this year.
Stretching the season past the first frost
With roughly 2 weeks until Republic's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/30 isn't a guarantee
05/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/17 and only about 1 year in 10 sees frost after that.
Republic against the rest of the dataset
At roughly 102 frost-free days, Republic places 39,666 of 40,283 ZIP codes in this dataset. Within WA, it ranks 677 of 700.
Learn more
Before leaning on 99166's figures: the frost range explains how to read the range around Republic's dates instead of trusting one, while local microclimates explains what one yard in Republic can differ from the 99166 normal.