Spokane, WA 99224 Frost Dates
Spokane, 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 10/12, roughly 168 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Spokane, not a forecast for this year.
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.
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
Spokane's growing season runs about 168 days, ranking 29,649 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 538 of 700.
Learn more
Before leaning on 99224's figures: zone vs. frost date explains why Zone 6b and Spokane's frost date answer different questions, while the frost range explains how to read the range around Spokane's dates instead of trusting one.