Valier, MT 59448 Frost Dates
Frost dates for Valier, MT, ZIP 59448
The last spring frost here typically falls around 06/08, about 284 days from today. The first fall frost typically arrives around 09/05, about 88 frost-free days later.
Valier sits in USDA Zone 4b (-25 to -20°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 4b around Valier 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 Valier's last frost
06/08 is the middle of 30 years of NOAA records, not a promise. Plant by 05/24 and you're betting against frost in roughly 9 years out of 10. 07/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Valier compares
About 88 days separate Valier's last and first frost, putting it 39,956 of 40,283 ZIP codes nationally. Within MT, it ranks 346 of 392.
Learn more
local microclimates explains what one yard in Valier can differ from the 59448 normal, and zone vs. frost date explains why Zone 4b and Valier's frost date answer different questions.