Yakima, WA 98939 Frost Dates
Frost dates for Yakima, WA, ZIP 98939
The last spring frost here typically falls around 04/08, about 223 days from today. The first fall frost typically arrives around 10/23, about 196 frost-free days later.
Yakima sits in USDA Zone 7a (0 to 5°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 7a around Yakima has about 8 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
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Yakima compares
Yakima's growing season runs about 196 days, ranking 18,906 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 345 of 700.
Learn more
the frost range explains how to read the range around Yakima's dates instead of trusting one, and local microclimates explains what one yard in Yakima can differ from the 98939 normal.