Springdale, WA 99173 Frost Dates
Frost dates for Springdale, WA, ZIP 99173
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 09/15, about 120 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 Springdale, not a forecast for this year.
What to do before the first frost
Zone 6b around Springdale has about 3 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 05/16 isn't a guarantee
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 06/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Springdale compares
About 120 days separate Springdale's last and first frost, putting it 39,098 of 40,283 ZIP codes nationally. Within WA, it ranks 660 of 700.
Learn more
zone vs. frost date explains why Zone 6b and Springdale's frost date answer different questions, and the frost range explains how to read the range around Springdale's dates instead of trusting one.