Freeze Warning
Status
Event Continued Active alertStart Time
Tue 10/21/2025 02:00 AM EDTEnd Time
Tue 10/21/2025 10:00 AM EDTSignificance
WarningImpacts
High impact
Locations Affected
Denver, CO ∙ Aurora, CO ∙ Fort Collins, CO ∙ Lakewood, CO ∙ Arvada, CO ∙ Centennial, CO ∙ Thornton, CO ∙ Westminster, CO ∙ Boulder, CO ∙ Longmont, COFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service Denver CO 1052 AM MDT Mon Oct 20 2025 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... * WHAT...Freezing or near freezing low temperatures between 29 and 34 degrees. The coldest readings will occur from Fort Collins through Longmont, and also east and south of Denver metro. * WHERE...Fort Collins, Boulder, Denver metro area, Castle Rock, and Byers. * WHEN...From midnight tonight to 8 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. Damage may also occur to unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold, either moving them indoors or covering with blankets. To prevent water pipes from freezing, wrap or drain any above ground sprinkler systems.
Technical Header
COZ039>041-045-211200- /O.CON.KBOU.FZ.W.0002.251021T0600Z-251021T1400Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet-Central and East Adams and Arapahoe Counties- Including the cities of Longmont, Bennett, Leader, Elbert, Highlands Ranch, Larkspur, Arvada, Aurora, Golden, Littleton, Parker, Kiowa, Deer Trail, Boulder, Fondis, Denver International Airport, Lakewood, Byers, Castle Rock, City of Denver, and Brighton 1052 AM MDT Mon Oct 20 2025
