Mountain Home, ID 83648 Frost Dates
Mountain Home, ID: when does the frost end?
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/08, roughly 157 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mountain Home in Zone 7a (0 to 5°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
With roughly 6 weeks until Mountain Home's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Mountain Home against the rest of the dataset
About 157 days separate Mountain Home's last and first frost, putting it 33,254 of 40,283 ZIP codes nationally. Within ID, it ranks 87 of 320.
Learn more
Before leaning on 83648's figures: local microclimates explains what one yard in Mountain Home can differ from the 83648 normal, while zone vs. frost date explains why Zone 7a and Mountain Home's frost date answer different questions.