Horseshoe Bend, ID 83629 Frost Dates
83629, near Horseshoe Bend, ID: the frost window
Typically, the last spring freeze lands around 05/17, roughly 262 days out. Fall's first freeze usually shows up around 10/12, roughly 147 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Horseshoe Bend in Zone 7a (0 to 5°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
Horseshoe Bend'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 05/17 isn't a guarantee
05/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/10 and only about 1 year in 10 sees frost after that.
Horseshoe Bend against the rest of the dataset
At roughly 147 frost-free days, Horseshoe Bend places 35,945 of 40,283 ZIP codes in this dataset. Within ID, it ranks 133 of 320.
Learn more
Two guides worth reading on 83629: local microclimates, on what one yard in Horseshoe Bend can differ from the 83629 normal, and zone vs. frost date, on why Zone 7a and Horseshoe Bend's frost date answer different questions.