Flaxville, MT 59257 Frost Dates
When can you plant in Flaxville, MT?
Typically, the last spring freeze lands around 05/28, roughly 273 days out. The first fall frost typically arrives around 09/07, about 101 frost-free days later.
Flaxville sits in USDA Zone 3b (-35 to -30°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
About 1 week of growing season left in Flaxville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/28 isn't a guarantee
05/28 is the middle of 30 years of NOAA records, not a promise. Plant by 05/15 and you're betting against frost in roughly 9 years out of 10. 06/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Flaxville compares
At roughly 101 frost-free days, Flaxville places 39,701 of 40,283 ZIP codes in this dataset. Within MT, it ranks 302 of 392.
Learn more
zone vs. frost date covers why Zone 3b and Flaxville's frost date answer different questions. the frost range covers how to read the range around Flaxville's dates instead of trusting one.