Frost Advisory

Locations Affected

Denver, CO ∙ Aurora, CO ∙ Lakewood, CO ∙ Thornton, CO ∙ Westminster, CO ∙ Boulder, CO ∙ Arvada, CO ∙ Centennial, CO ∙ Longmont, CO ∙ Broomfield, CO

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Denver CO 113 PM MDT Sat Oct 18 2025 ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM MDT SUNDAY... * WHAT...Temperatures in the 32 to 36 degree range will result in frost formation. * WHERE...Boulder and Denver metro areas. * WHEN...From 10 PM this evening to 8 AM MDT Sunday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. Patchy freezing temperatures will also be possible for the coldest locations, namely in and around Longmont and the suburbs north of Denver. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Move them indoors or cover with layers of blankets.

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