Tonasket, WA 98855 Frost Dates
Frost dates for Tonasket, WA, ZIP 98855
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/06, about 151 frost-free days later.
Tonasket 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 Tonasket has about 6 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
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tonasket compares
At roughly 151 frost-free days, Tonasket places 35,086 of 40,283 ZIP codes in this dataset. Within WA, it ranks 599 of 700.
Learn more
the frost range explains how to read the range around Tonasket's dates instead of trusting one, and local microclimates explains what one yard in Tonasket can differ from the 98855 normal.