Valier, MT 59432 Frost Dates
Valier, MT: when does the frost end?
The last spring frost here typically falls around 06/09, about 285 days from today. Fall's first freeze usually shows up around 09/03, roughly 86 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Valier, not a forecast for this year.
Stretching the season past the first frost
With roughly 1 week until Valier's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
06/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/02 and only about 1 year in 10 sees frost after that.
Valier against the rest of the dataset
Valier's growing season runs about 86 days, ranking 39,977 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 349 of 392.
Learn more
Before leaning on 59432's figures: the frost range explains how to read the range around Valier's dates instead of trusting one, while local microclimates explains what one yard in Valier can differ from the 59432 normal.