Salmon, ID 83467 Frost Dates
83467, near Salmon, ID: the frost window
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/08, roughly 157 days after the last spring frost.
Zone 5b (-15 to -10°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 Salmon, not a forecast for this year.
Stretching the season past the first frost
Salmon's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Salmon against the rest of the dataset
About 157 days separate Salmon's last and first frost, putting it 33,317 of 40,283 ZIP codes nationally. Within ID, it ranks 88 of 320.
Learn more
Two guides worth reading on 83467: the frost range, on how to read the range around Salmon's dates instead of trusting one, and local microclimates, on what one yard in Salmon can differ from the 83467 normal.