Missoula, MT 59823 Frost Dates

Missoula, MT: when does the frost end?

The NOAA station nearest to 59823 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 40,233 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 384 of 392.

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Before leaning on 59823's figures: zone vs. frost date explains why Zone 5b and Missoula's frost date answer different questions, while local microclimates explains what one yard in Missoula can differ from the 59823 normal.