American Falls, ID 83211 Frost Dates
American Falls, ID: when does the frost end?
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/08, roughly 155 days after the last spring frost.
American Falls sits in USDA Zone 6a (-10 to -5°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.
Stretching the season past the first frost
With roughly 6 weeks until American Falls's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around American Falls's last frost
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
American Falls against the rest of the dataset
At roughly 155 frost-free days, American Falls places 33,960 of 40,283 ZIP codes in this dataset. Within ID, it ranks 93 of 320.
Learn more
Before leaning on 83211's figures: the frost range explains how to read the range around American Falls's dates instead of trusting one, while local microclimates explains what one yard in American Falls can differ from the 83211 normal.