Airway Heights, WA 99026 Frost Dates
Frost dates for Airway Heights, WA, ZIP 99026
The last spring frost here typically falls around 05/10, about 255 days from today. The first fall frost typically arrives around 09/26, about 137 frost-free days later.
Airway Heights sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6b around Airway Heights has about 4 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.
The actual range around Airway Heights's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Airway Heights compares
Airway Heights's growing season runs about 137 days, ranking 37,497 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 619 of 700.
Learn more
local microclimates explains what one yard in Airway Heights can differ from the 99026 normal, and zone vs. frost date explains why Zone 6b and Airway Heights's frost date answer different questions.