Kootenai, ID 83825 Frost Dates
83825, near Kootenai, ID: the frost window
Around 05/08 is the usual last spring frost, about 253 days away. Fall's first freeze usually shows up around 09/28, roughly 141 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kootenai in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Kootenai's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Kootenai against the rest of the dataset
Kootenai's growing season runs about 141 days, ranking 36,927 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 148 of 320.
Learn more
Two guides worth reading on 83825: zone vs. frost date, on why Zone 6b and Kootenai's frost date answer different questions, and the frost range, on how to read the range around Kootenai's dates instead of trusting one.