Oldtown, ID 83822 Frost Dates
83822, near Oldtown, ID: the frost window
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 09/21, roughly 130 days after the last spring frost.
Oldtown 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
Oldtown's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Oldtown's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Oldtown against the rest of the dataset
About 130 days separate Oldtown's last and first frost, putting it 38,411 of 40,283 ZIP codes nationally. Within ID, it ranks 182 of 320.
Learn more
Two guides worth reading on 83822: local microclimates, on what one yard in Oldtown can differ from the 83822 normal, and zone vs. frost date, on why Zone 6a and Oldtown's frost date answer different questions.