Cheney, WA 99004 Frost Dates
Frost dates for Cheney, WA, ZIP 99004
Typically, the last spring freeze lands around 05/30, roughly 275 days out. The first fall frost typically arrives around 09/04, about 94 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 Cheney, not a forecast for this year.
What to do before the first frost
Zone 6b around Cheney has about 1 week 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.
Why 05/30 isn't a guarantee
05/30 is the middle of 30 years of NOAA records, not a promise. Plant by 05/09 and you're betting against frost in roughly 9 years out of 10. 07/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cheney compares
Cheney's growing season runs about 94 days, ranking 39,818 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 685 of 700.
Learn more
local microclimates explains what one yard in Cheney can differ from the 99004 normal, and zone vs. frost date explains why Zone 6b and Cheney's frost date answer different questions.