Salmon, ID 83469 Frost Dates
Salmon, ID: when does the frost end?
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
With roughly 6 weeks until Salmon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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
At roughly 157 frost-free days, Salmon places 33,318 of 40,283 ZIP codes in this dataset. Within ID, it ranks 89 of 320.
Learn more
Before leaning on 83469's figures: zone vs. frost date explains why Zone 5b and Salmon's frost date answer different questions, while the frost range explains how to read the range around Salmon's dates instead of trusting one.