Ruston, WA 98407 Frost Dates
98407, near Ruston, WA: the frost window
Typically, the last spring freeze lands around 03/11, roughly 195 days out. Fall's first freeze usually shows up around 11/21, roughly 254 days after the last spring frost.
Ruston sits in USDA Zone 9a (20 to 25°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
Ruston's growing season runs out in roughly 12 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 Ruston's last frost
03/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Ruston against the rest of the dataset
At roughly 254 frost-free days, Ruston places 7,042 of 40,283 ZIP codes in this dataset. Within WA, it ranks 73 of 700.
Learn more
Two guides worth reading on 98407: the frost range, on how to read the range around Ruston's dates instead of trusting one, and local microclimates, on what one yard in Ruston can differ from the 98407 normal.