St. Ignatius, MT 59868 Frost Dates
St. Ignatius, MT: when does the frost end?
The NOAA station nearest to 59868 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 5a (-20 to -15°F average annual minimum).
St. Ignatius against the rest of the dataset
At roughly 74 frost-free days, St. Ignatius places 40,098 of 40,283 ZIP codes in this dataset. Within MT, it ranks 370 of 392.
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Before leaning on 59868's figures: local microclimates explains what one yard in St. Ignatius can differ from the 59868 normal, while the methodology explains exactly which NOAA and USDA figures feed 59868's numbers.