Spokane, WA 99260 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
About 168 days separate Spokane's last and first frost, putting it 29,654 of 40,283 ZIP codes nationally. Within WA, it ranks 543 of 700.
Learn more
Before leaning on 99260's figures: local microclimates explains what one yard in Spokane can differ from the 99260 normal, while zone vs. frost date explains why Zone 7a and Spokane's frost date answer different questions.