Tetonia, ID 83452 Frost Dates
83452, near Tetonia, ID: the frost window
The last spring frost here typically falls around 06/15, about 291 days from today. Fall's first freeze usually shows up around 09/07, roughly 85 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Tetonia, not a forecast for this year.
Stretching the season past the first frost
Tetonia's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Tetonia's last frost
06/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/29 and only about 1 year in 10 sees frost after that.
Tetonia against the rest of the dataset
At roughly 85 frost-free days, Tetonia places 39,995 of 40,283 ZIP codes in this dataset. Within ID, it ranks 282 of 320.
Learn more
Two guides worth reading on 83452: local microclimates, on what one yard in Tetonia can differ from the 83452 normal, and zone vs. frost date, on why Zone 5a and Tetonia's frost date answer different questions.