Plains, MT 59859 Frost Dates
When can you plant in Plains, MT?
The NOAA station nearest to 59859 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 6a (-10 to -5°F average annual minimum).
How Plains compares
At roughly 101 frost-free days, Plains places 39,679 of 40,283 ZIP codes in this dataset. Within MT, it ranks 296 of 392.
Learn more
the methodology covers exactly which NOAA and USDA figures feed 59859's numbers. zone vs. frost date covers why Zone 6a and Plains's frost date answer different questions.