Spokane Valley, WA 99206 Frost Dates
99206, near Spokane Valley, WA: the frost window
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/15, roughly 170 days after the last spring frost.
Zone 7a (0 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 Spokane Valley, not a forecast for this year.
Stretching the season past the first frost
Spokane Valley's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Spokane Valley against the rest of the dataset
Spokane Valley's growing season runs about 170 days, ranking 28,871 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 495 of 700.
Learn more
Two guides worth reading on 99206: the frost range, on how to read the range around Spokane Valley's dates instead of trusting one, and local microclimates, on what one yard in Spokane Valley can differ from the 99206 normal.