Spokane, WA 99211 Frost Dates
Spokane, WA: when does the frost end?
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
With roughly 6 weeks until Spokane'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 04/09 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 29,644 of 40,283 ZIP codes in this dataset. Within WA, it ranks 533 of 700.
Learn more
Before leaning on 99211's figures: local microclimates explains what one yard in Spokane can differ from the 99211 normal, while zone vs. frost date explains why Zone 7a and Spokane's frost date answer different questions.