Riggins, ID 83671 Frost Dates
Riggins, ID: when does the frost end?
The NOAA station nearest to 83671 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).
Riggins against the rest of the dataset
Riggins's growing season runs about 23 days, ranking 40,275 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 317 of 320.
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Before leaning on 83671's figures: zone vs. frost date explains why Zone 5a and Riggins's frost date answer different questions, while local microclimates explains what one yard in Riggins can differ from the 83671 normal.