Missoula, MT 59825 Frost Dates
59825, near Missoula, MT: the frost window
The NOAA station nearest to 59825 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 5b (-15 to -10°F average annual minimum).
Missoula against the rest of the dataset
Missoula's growing season runs about 45 days, ranking 40,234 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 385 of 392.
Learn more
Two guides worth reading on 59825: the methodology, on exactly which NOAA and USDA figures feed 59825's numbers, and zone vs. frost date, on why Zone 5b and Missoula's frost date answer different questions.