Harrah, WA 98933 Frost Dates
Frost dates for Harrah, WA, ZIP 98933
Around 05/08 is the usual last spring frost, about 253 days away. The first fall frost typically arrives around 10/04, about 149 frost-free days later.
Harrah 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 Harrah has about 5 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
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Harrah compares
About 149 days separate Harrah's last and first frost, putting it 35,553 of 40,283 ZIP codes nationally. Within WA, it ranks 606 of 700.
Learn more
local microclimates explains what one yard in Harrah can differ from the 98933 normal, and zone vs. frost date explains why Zone 7a and Harrah's frost date answer different questions.