Cut Bank, MT 59417 Frost Dates
Frost dates for Cut Bank, MT, ZIP 59417
Typically, the last spring freeze lands around 06/08, roughly 284 days out. The first fall frost typically arrives around 09/05, about 88 frost-free days later.
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.
What to do before the first frost
Zone 4a around Cut Bank 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.
How much risk comes with planting early here
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 Cut Bank compares
Cut Bank's growing season runs about 88 days, ranking 39,942 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 343 of 392.
Learn more
zone vs. frost date explains why Zone 4a and Cut Bank's frost date answer different questions, and the frost range explains how to read the range around Cut Bank's dates instead of trusting one.