Bonners Ferry, ID 83847 Frost Dates
83847, near Bonners Ferry, ID: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/04, roughly 154 days after the last spring frost.
Zone 6b (-5 to 0°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 Bonners Ferry, not a forecast for this year.
Stretching the season past the first frost
Bonners Ferry's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Bonners Ferry against the rest of the dataset
At roughly 154 frost-free days, Bonners Ferry places 34,329 of 40,283 ZIP codes in this dataset. Within ID, it ranks 99 of 320.
Learn more
Two guides worth reading on 83847: the frost range, on how to read the range around Bonners Ferry's dates instead of trusting one, and local microclimates, on what one yard in Bonners Ferry can differ from the 83847 normal.