Philipsburg, MT 59858 Frost Dates
Philipsburg, MT: when does the frost end?
The NOAA station nearest to 59858 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).
Philipsburg against the rest of the dataset
About 65 days separate Philipsburg's last and first frost, putting it 40,153 of 40,283 ZIP codes nationally. Within MT, it ranks 377 of 392.
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Before leaning on 59858's figures: local microclimates explains what one yard in Philipsburg can differ from the 59858 normal, while the methodology explains exactly which NOAA and USDA figures feed 59858's numbers.