Powell County, MT

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Valley Frost Tuesday Morning

Created by the NWS Missoula WFO

Chilly morning temperatures will arrive across the region on Tuesday, September 15. Low temperatures are expected to drop into the low to mid-30s, bringing scattered to widespread frost. Areas most at risk include western Montana (primarily south of I-90) and higher-elevation valleys of north-central Idaho, with more widespread frost likely in sheltered locations and along the Continental Divide. Consider covering or bringing sensitive vegetation indoors Monday night.

Weather graphic titled "Valley Frost" from NWS Missoula for Tuesday Morning, Sep 15, 2026. Low temperatures are projected to drop into the low to mid 30s across Western MT (mainly I-90 southward) and higher elevation valleys of North-central ID. Scattered frost will become widespread across higher valleys and protected areas along the Divide. Bullet points advise taking action to protect sensitive vegetation. Close-up photo shows frosted green leaves on the left.
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