Grace, ID 83241 Frost Dates
83241, near Grace, ID: the frost window
Typically, the last spring freeze lands around 05/29, roughly 274 days out. Fall's first freeze usually shows up around 09/17, roughly 111 days after the last spring frost.
Grace sits in USDA Zone 5b (-15 to -10°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
Grace'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.
Why 05/29 isn't a guarantee
05/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/16 and only about 1 year in 10 sees frost after that.
Grace against the rest of the dataset
Grace's growing season runs about 111 days, ranking 39,470 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 235 of 320.
Learn more
Two guides worth reading on 83241: local microclimates, on what one yard in Grace can differ from the 83241 normal, and zone vs. frost date, on why Zone 5b and Grace's frost date answer different questions.