Winter Weather in Eastern Lemhi County, Idaho

Winter Weather May 17, 2026 – May 19, 2026 · Eastern Lemhi County, Idaho

What the National Weather Service wrote

Between 4 to 6 inches of snow fell above 6000 feet towards Lost Trail Pass. Cold, frosty mornings followed in the Salmon Valley. Lows on May 17 ranged from 25 to 29 degrees in the Salmon area and 21 degrees in Leadore. On May 18, lows were 31 to 34 degrees in Salmon, and on May 19, lows ranged from 27 to 32 degrees in the Salmon area.

The wider storm

An unseasonably cold upper-level trough, originally an Aleutian Low/Gulf of Alaska low, sagged south over the Pacific Northwest and Northern Rockies and brought a prolonged period of late-season winter weather, including accumulating mountain snow and unseasonably cold temperatures leading to frost and hard freezes across north-central Idaho.

Source: NOAA Storm Events Database, event 1329753. Narratives are written by the National Weather Service forecast office that issued the report.

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