Valier, MT 59486 Frost Dates
When can you plant in Valier, MT?
Around 05/17 is the usual last spring frost, about 262 days away. The first fall frost typically arrives around 09/24, about 129 frost-free days later.
The USDA Plant Hardiness Zone Map puts Valier in Zone 4b (-25 to -20°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 4 weeks of growing season left in Valier 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
05/17 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Valier compares
About 129 days separate Valier's last and first frost, putting it 38,487 of 40,283 ZIP codes nationally. Within MT, it ranks 140 of 392.
Learn more
the frost range covers how to read the range around Valier's dates instead of trusting one. local microclimates covers what one yard in Valier can differ from the 59486 normal.