Smelterville, ID 83868 Frost Dates
Frost dates for Smelterville, ID, ZIP 83868
Around 05/14 is the usual last spring frost, about 259 days away. The first fall frost typically arrives around 09/26, about 131 frost-free days later.
Smelterville sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6b around Smelterville has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Smelterville's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Smelterville compares
At roughly 131 frost-free days, Smelterville places 38,315 of 40,283 ZIP codes in this dataset. Within ID, it ranks 179 of 320.
Learn more
the frost range explains how to read the range around Smelterville's dates instead of trusting one, and local microclimates explains what one yard in Smelterville can differ from the 83868 normal.