Spokane, WA 99204 Frost Dates
99204, near Spokane, WA: the frost window
Around 04/26 is the usual last spring frost, about 241 days away. Fall's first freeze usually shows up around 10/12, roughly 168 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Spokane in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Spokane's growing season runs out in roughly 6 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 Spokane's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 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 against the rest of the dataset
At roughly 168 frost-free days, Spokane places 29,642 of 40,283 ZIP codes in this dataset. Within WA, it ranks 531 of 700.
Learn more
Two guides worth reading on 99204: local microclimates, on what one yard in Spokane can differ from the 99204 normal, and zone vs. frost date, on why Zone 7a and Spokane's frost date answer different questions.