Pomeroy, WA 99347 Frost Dates
99347, near Pomeroy, WA: the frost window
Typically, the last spring freeze lands around 04/06, roughly 221 days out. Fall's first freeze usually shows up around 10/26, roughly 200 days after the last spring frost.
Pomeroy sits in USDA Zone 7a (0 to 5°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
Pomeroy's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Pomeroy's last frost
04/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/26 and only about 1 year in 10 sees frost after that.
Pomeroy against the rest of the dataset
At roughly 200 frost-free days, Pomeroy places 17,828 of 40,283 ZIP codes in this dataset. Within WA, it ranks 326 of 700.
Learn more
Two guides worth reading on 99347: local microclimates, on what one yard in Pomeroy can differ from the 99347 normal, and zone vs. frost date, on why Zone 7a and Pomeroy's frost date answer different questions.