Montpelier, ID 83254 Frost Dates
When can you plant in Montpelier, ID?
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 5a (-20 to -15°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
About 1 week of growing season left in Montpelier before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
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 40,074 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 290 of 320.
Learn more
local microclimates covers what one yard in Montpelier can differ from the 83254 normal. zone vs. frost date covers why Zone 5a and Montpelier's frost date answer different questions.