Superior, MT 59866 Frost Dates
When can you plant in Superior, MT?
The NOAA station nearest to 59866 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 Superior compares
About 101 days separate Superior's last and first frost, putting it 39,680 of 40,283 ZIP codes nationally. Within MT, it ranks 297 of 392.
Learn more
local microclimates covers what one yard in Superior can differ from the 59866 normal. the methodology covers exactly which NOAA and USDA figures feed 59866's numbers.