Clifton, ID 83228 Frost Dates
83228, near Clifton, ID: the frost window
Around 05/16 is the usual last spring frost, about 261 days away. Fall's first freeze usually shows up around 09/28, roughly 133 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Clifton in Zone 6b (-5 to 0°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
Clifton's growing season runs out in roughly 4 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 Clifton's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/04 and only about 1 year in 10 sees frost after that.
Clifton against the rest of the dataset
About 133 days separate Clifton's last and first frost, putting it 38,092 of 40,283 ZIP codes nationally. Within ID, it ranks 164 of 320.
Learn more
Two guides worth reading on 83228: the frost range, on how to read the range around Clifton's dates instead of trusting one, and local microclimates, on what one yard in Clifton can differ from the 83228 normal.