Kootenai, ID 83864 Frost Dates
Frost dates for Kootenai, ID, ZIP 83864
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 09/28, about 141 frost-free days later.
The USDA Plant Hardiness Zone Map puts Kootenai in Zone 6a (-10 to -5°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 6a around Kootenai has about 4 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.
The actual range around Kootenai's last frost
05/08 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 Kootenai compares
At roughly 141 frost-free days, Kootenai places 36,929 of 40,283 ZIP codes in this dataset. Within ID, it ranks 150 of 320.
Learn more
local microclimates explains what one yard in Kootenai can differ from the 83864 normal, and zone vs. frost date explains why Zone 6a and Kootenai's frost date answer different questions.