Spokane, WA 99208 Frost Dates
99208, near Spokane, WA: the frost window
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.
The USDA Plant Hardiness Zone Map puts Spokane in Zone 6b (-5 to 0°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 7 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 04/10 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 against the rest of the dataset
Spokane's growing season runs about 170 days, ranking 28,867 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 491 of 700.
Learn more
Two guides worth reading on 99208: zone vs. frost date, on why Zone 6b and Spokane's frost date answer different questions, and the frost range, on how to read the range around Spokane's dates instead of trusting one.