Fairfield, MT 59443 Frost Dates
When can you plant in Fairfield, MT?
The last spring frost here typically falls around 06/02, about 278 days from today. The first fall frost typically arrives around 09/10, about 96 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fairfield in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 2 weeks of growing season left in Fairfield before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 06/02 isn't a guarantee
06/02 is the middle of 30 years of NOAA records, not a promise. Plant by 05/18 and you're betting against frost in roughly 9 years out of 10. 06/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairfield compares
At roughly 96 frost-free days, Fairfield places 39,798 of 40,283 ZIP codes in this dataset. Within MT, it ranks 324 of 392.
Learn more
the frost range covers how to read the range around Fairfield's dates instead of trusting one. local microclimates covers what one yard in Fairfield can differ from the 59443 normal.