Spokane, WA 99203 Frost Dates
Frost dates for Spokane, WA, ZIP 99203
The last spring frost here typically falls around 04/26, about 241 days from today. The first fall frost typically arrives around 10/15, about 170 frost-free days later.
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.
What to do before the first frost
Zone 6b around Spokane has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Spokane compares
About 170 days separate Spokane's last and first frost, putting it 28,864 of 40,283 ZIP codes nationally. Within WA, it ranks 488 of 700.
Learn more
the frost range explains how to read the range around Spokane's dates instead of trusting one, and local microclimates explains what one yard in Spokane can differ from the 99203 normal.