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Home Return to list Frost Advisory 0001 Issued by the Denver / Boulder Forecast Office
Action: New Issued At: 2026-05-18 12:37:19 089 WWUS75 KBOU 181736 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 1136 AM MDT Mon May 18 2026 COZ039-040-181845- /O.CAN.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ 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- Including the cities of Denver International Airport, Parker, Longmont, Boulder, Lakewood, Brighton, Arvada, Aurora, Highlands Ranch, Golden, Littleton, and City of Denver 1136 AM MDT Mon May 18 2026 ...FREEZE WATCH IS CANCELLED... Temperatures will be cold tonight, but should hover just above freezing over most of Denver due to expected cloud cover. $$ COZ041-191200- /O.UPG.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ /O.NEW.KBOU.FZ.W.0003.260519T0600Z-260519T1400Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Larkspur, Castle Rock, Kiowa, Elbert, and Fondis 1136 AM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... * WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Castle Rock and the Palmer Divide. * WHEN...From midnight tonight to 8 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Cover sensitive outdoor vegetation with blankets or buckets. && $$ COZ038-042>051-191200- /O.UPG.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ /O.NEW.KBOU.FR.Y.0001.260519T0600Z-260519T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County-Logan County- Washington County-Sedgwick County-Phillips County- Including the cities of Hereford, Fort Morgan, Amherst, Punkin Center, Sedgwick, Last Chance, Merino, Raymer, Crook, Briggsdale, Cope, Agate, Fort Lupton, Wiggins, Matheson, Karval, Roggen, Stoneham, Brush, Pawnee Buttes, Goodrich, Bennett, Nunn, Byers, Eaton, Haxtun, Loveland, Deer Trail, Hugo, Kutch, Holyoke, Peetz, Forder, Ovid, Fort Collins, Sterling, Otis, Akron, Julesburg, Limon, Greeley, Grover, and Leader 1136 AM MDT Mon May 18 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Most of the northeast plains of Colorado. * WHEN...From midnight tonight to 8 AM MDT Tuesday. * IMPACTS...Frost conditions could harm sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Cover sensitive outdoor vegetation with blankets or buckets. && $$ For more information from the National Weather Service, visit https://weather.gov/bou 20 Action: Continued Issued At: 2026-05-19 06:15:09 625 WWUS75 KBOU 191114 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 514 AM MDT Tue May 19 2026 COZ041-191400- /O.CON.KBOU.FZ.W.0003.000000T0000Z-260519T1400Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Kiowa, Larkspur, Castle Rock, Fondis, and Elbert 514 AM MDT Tue May 19 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 29. * WHERE...Castle Rock and the Palmer Divide. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps to protect tender plants from the cold. && $$ COZ038-042>051-191400- /O.CON.KBOU.FR.Y.0001.000000T0000Z-260519T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County-Logan County- Washington County-Sedgwick County-Phillips County- Including the cities of Raymer, Fort Lupton, Eaton, Peetz, Roggen, Haxtun, Deer Trail, Brush, Amherst, Greeley, Cope, Pawnee Buttes, Nunn, Akron, Grover, Bennett, Sterling, Goodrich, Matheson, Fort Collins, Briggsdale, Wiggins, Loveland, Stoneham, Kutch, Fort Morgan, Ovid, Sedgwick, Holyoke, Hereford, Hugo, Crook, Leader, Last Chance, Forder, Byers, Julesburg, Agate, Limon, Punkin Center, Merino, Karval, and Otis 514 AM MDT Tue May 19 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Most of the northeast plains of Colorado. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost conditions could harm sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou AP Action: Expired Issued At: 2026-05-19 08:59:15 497 WWUS75 KBOU 191358 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 758 AM MDT Tue May 19 2026 COZ041-191500- /O.EXP.KBOU.FZ.W.0003.000000T0000Z-260519T1400Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Castle Rock, Fondis, Larkspur, Kiowa, and Elbert 758 AM MDT Tue May 19 2026 ...FREEZE WARNING WILL EXPIRE AT 8 AM MDT THIS MORNING... Temperatures will continue to slowly warm, therefore the Freeze Warning will be allowed to expire. $$ COZ038-042>051-191500- /O.EXP.KBOU.FR.Y.0001.000000T0000Z-260519T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County-Logan County- Washington County-Sedgwick County-Phillips County- Including the cities of Bennett, Fort Morgan, Goodrich, Deer Trail, Akron, Forder, Last Chance, Sedgwick, Fort Collins, Hugo, Eaton, Raymer, Amherst, Hereford, Brush, Haxtun, Roggen, Agate, Fort Lupton, Pawnee Buttes, Matheson, Byers, Stoneham, Otis, Holyoke, Wiggins, Limon, Karval, Kutch, Greeley, Cope, Loveland, Leader, Julesburg, Ovid, Sterling, Punkin Center, Merino, Grover, Crook, Nunn, Peetz, and Briggsdale 758 AM MDT Tue May 19 2026 ...FROST ADVISORY WILL EXPIRE AT 8 AM MDT THIS MORNING... Temperatures will continue to slowly warm, therefore the Frost Advisory will be allowed to expire. $$ For more information from the National Weather Service, visit https://weather.gov/bou Meier | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||