Cut Bank, MT 59434 Frost Dates
59434, near Cut Bank, MT: the frost window
Around 06/08 is the usual last spring frost, about 284 days away. Fall's first freeze usually shows up around 09/05, roughly 88 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Cut Bank in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Cut Bank's growing season runs out in roughly 1 week — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Cut Bank's last frost
06/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 07/01 and only about 1 year in 10 sees frost after that.
Cut Bank against the rest of the dataset
Cut Bank's growing season runs about 88 days, ranking 39,943 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 344 of 392.
Learn more
Two guides worth reading on 59434: the frost range, on how to read the range around Cut Bank's dates instead of trusting one, and local microclimates, on what one yard in Cut Bank can differ from the 59434 normal.