Kootenai, ID 83840 Frost Dates
When can you plant in Kootenai, ID?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. The first fall frost typically arrives around 09/28, about 141 frost-free days later.
Kootenai 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
About 4 weeks of growing season left in Kootenai before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 36,928 of 40,283 ZIP codes in this dataset. Within ID, it ranks 149 of 320.
Learn more
local microclimates covers what one yard in Kootenai can differ from the 83840 normal. zone vs. frost date covers why Zone 6b and Kootenai's frost date answer different questions.