Kooskia, ID 83539 Frost Dates
Frost dates for Kooskia, ID, ZIP 83539
The last spring frost here typically falls around 04/16, about 231 days from today. The first fall frost typically arrives around 10/25, about 191 frost-free days later.
The USDA Plant Hardiness Zone Map puts Kooskia in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5b around Kooskia 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 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 03/26 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Kooskia compares
About 191 days separate Kooskia's last and first frost, putting it 20,879 of 40,283 ZIP codes nationally. Within ID, it ranks 5 of 320.
Learn more
the frost range explains how to read the range around Kooskia's dates instead of trusting one, and local microclimates explains what one yard in Kooskia can differ from the 83539 normal.