Spokane Valley, WA 99037 Frost Dates
Spokane Valley, WA: when does the frost end?
Typically, the last spring freeze lands around 04/26, roughly 241 days out. Fall's first freeze usually shows up around 10/15, roughly 170 days after the last spring frost.
Spokane Valley 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
With roughly 7 weeks until Spokane Valley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
About 170 days separate Spokane Valley's last and first frost, putting it 28,870 of 40,283 ZIP codes nationally. Within WA, it ranks 494 of 700.
Learn more
Before leaning on 99037's figures: the frost range explains how to read the range around Spokane Valley's dates instead of trusting one, while local microclimates explains what one yard in Spokane Valley can differ from the 99037 normal.