Thompson Falls, MT 59830 Frost Dates
Thompson Falls, MT: when does the frost end?
The NOAA station nearest to 59830 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).
Thompson Falls against the rest of the dataset
About 90 days separate Thompson Falls's last and first frost, putting it 39,912 of 40,283 ZIP codes nationally. Within MT, it ranks 335 of 392.
Learn more
Before leaning on 59830's figures: local microclimates explains what one yard in Thompson Falls can differ from the 59830 normal, while the methodology explains exactly which NOAA and USDA figures feed 59830's numbers.