Montpelier, ID 83238 Frost Dates
Frost dates for Montpelier, ID, ZIP 83238
Around 06/17 is the usual last spring frost, about 293 days away. The first fall frost typically arrives around 09/03, about 77 frost-free days later.
The USDA Plant Hardiness Zone Map puts Montpelier in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5b around Montpelier has about 1 week 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 Montpelier's last frost
06/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/31 and you're betting against frost in roughly 9 years out of 10. 07/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Montpelier compares
Montpelier's growing season runs about 77 days, ranking 40,073 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 289 of 320.
Learn more
the frost range explains how to read the range around Montpelier's dates instead of trusting one, and local microclimates explains what one yard in Montpelier can differ from the 83238 normal.