Shelley, ID 83274 Frost Dates
83274, near Shelley, ID: the frost window
The last spring frost here typically falls around 05/23, about 268 days from today. Fall's first freeze usually shows up around 09/20, roughly 114 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Shelley in Zone 5b (-15 to -10°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
Shelley'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 Shelley's last frost
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/13 and only about 1 year in 10 sees frost after that.
Shelley against the rest of the dataset
About 114 days separate Shelley's last and first frost, putting it 39,353 of 40,283 ZIP codes nationally. Within ID, it ranks 231 of 320.
Learn more
Two guides worth reading on 83274: zone vs. frost date, on why Zone 5b and Shelley's frost date answer different questions, and the frost range, on how to read the range around Shelley's dates instead of trusting one.