Thompson Falls, MT 59867 Frost Dates

Thompson Falls, MT: when does the frost end?

The NOAA station nearest to 59867 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

Thompson Falls's growing season runs about 90 days, ranking 39,913 of 40,283 US ZIP codes measured here, longest to shortest. Within MT, it ranks 336 of 392.

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Before leaning on 59867's figures: local microclimates explains what one yard in Thompson Falls can differ from the 59867 normal, while the methodology explains exactly which NOAA and USDA figures feed 59867's numbers.