Nespelem, WA 99155 Frost Dates
Frost dates for Nespelem, WA, ZIP 99155
The last spring frost here typically falls around 04/22, about 237 days from today. The first fall frost typically arrives around 10/21, about 180 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 Nespelem, not a forecast for this year.
What to do before the first frost
Zone 6b around Nespelem 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.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Nespelem compares
Nespelem's growing season runs about 180 days, ranking 25,079 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 445 of 700.
Learn more
zone vs. frost date explains why Zone 6b and Nespelem's frost date answer different questions, and the frost range explains how to read the range around Nespelem's dates instead of trusting one.