Bainville, MT 59212 Frost Dates
When can you plant in Bainville, MT?
Around 05/21 is the usual last spring frost, about 266 days away. The first fall frost typically arrives around 09/20, about 120 frost-free days later.
Zone 4a (-30 to -25°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 Bainville, not a forecast for this year.
What to do before the first frost
About 3 weeks of growing season left in Bainville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/21 isn't a guarantee
05/21 is the middle of 30 years of NOAA records, not a promise. Plant by 05/08 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bainville compares
At roughly 120 frost-free days, Bainville places 39,104 of 40,283 ZIP codes in this dataset. Within MT, it ranks 219 of 392.
Learn more
the frost range covers how to read the range around Bainville's dates instead of trusting one. local microclimates covers what one yard in Bainville can differ from the 59212 normal.