Fairfield, WA 99012 Frost Dates
Fairfield, 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 09/04, roughly 94 days after the last spring frost.
Fairfield sits in USDA Zone 6b (-5 to 0°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 1 week until Fairfield'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 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/13 and only about 1 year in 10 sees frost after that.
Fairfield against the rest of the dataset
About 94 days separate Fairfield's last and first frost, putting it 39,845 of 40,283 ZIP codes nationally. Within WA, it ranks 688 of 700.
Learn more
Before leaning on 99012's figures: the frost range explains how to read the range around Fairfield's dates instead of trusting one, while local microclimates explains what one yard in Fairfield can differ from the 99012 normal.