Cut Bank, MT 59427 Frost Dates
59427, near Cut Bank, MT: the frost window
Typically, the last spring freeze lands around 05/24, roughly 269 days out. Fall's first freeze usually shows up around 09/15, roughly 113 days after the last spring frost.
Cut Bank sits in USDA Zone 4a (-30 to -25°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.
Stretching the season past the first frost
Cut Bank's growing season runs out in roughly 3 weeks — 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
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Cut Bank against the rest of the dataset
At roughly 113 frost-free days, Cut Bank places 39,390 of 40,283 ZIP codes in this dataset. Within MT, it ranks 256 of 392.
Learn more
Two guides worth reading on 59427: 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 59427 normal.