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Home Return to list Freeze Watch 0003 Issued by the Denver / Boulder Forecast Office
Action: New Issued At: 2026-05-17 12:54:23 484 WWUS75 KBOU 171753 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 1153 AM MDT Sun May 17 2026 COZ038>051-181200- /O.NEW.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-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-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 Sedgwick, Pawnee Buttes, Sterling, Holyoke, Loveland, Highlands Ranch, Larkspur, Arvada, Agate, Otis, Lakewood, Hereford, Akron, Eaton, Fort Morgan, Fort Lupton, Bennett, Aurora, Hugo, Grover, Golden, Briggsdale, Roggen, Stoneham, Wiggins, Peetz, Forder, Byers, Amherst, Raymer, Crook, Goodrich, Last Chance, City of Denver, Fort Collins, Littleton, Karval, Brush, Nunn, Brighton, Matheson, Julesburg, Kutch, Castle Rock, Kiowa, Longmont, Parker, Boulder, Greeley, Elbert, Denver International Airport, Deer Trail, Punkin Center, Fondis, Leader, Cope, Merino, Limon, Haxtun, and Ovid 1153 AM MDT Sun May 17 2026 ...FREEZE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 30 possible. * WHERE...The I-25 Urban Corridor and all of the plains of northeast Colorado. * WHEN...From late Monday night through early Tuesday morning. * 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. && $$ For more information from the National Weather Service, visit https://weather.gov/bou 20 Action: Continued Issued At: 2026-05-17 23:59:44 806 WWUS75 KBOU 180459 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 1059 PM MDT Sun May 17 2026 COZ038>051-182000- /O.CON.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-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-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 Akron, Wiggins, Sedgwick, Deer Trail, Littleton, Parker, Goodrich, Longmont, Holyoke, Larkspur, Fort Lupton, Matheson, Last Chance, Stoneham, Elbert, Amherst, Bennett, Karval, Fondis, Briggsdale, Highlands Ranch, Golden, Fort Collins, Grover, Arvada, Hereford, Forder, Limon, Roggen, Raymer, Fort Morgan, Julesburg, Peetz, Leader, Otis, Haxtun, Brush, Hugo, Agate, Brighton, Aurora, Nunn, Denver International Airport, City of Denver, Punkin Center, Cope, Loveland, Castle Rock, Byers, Eaton, Merino, Greeley, Pawnee Buttes, Sterling, Ovid, Lakewood, Kiowa, Boulder, Kutch, and Crook 1059 PM MDT Sun May 17 2026 ...FREEZE WATCH REMAINS IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING... * WHAT...Sub-freezing temperatures as low as 30 possible. * WHERE...The I-25 Urban Corridor and all of the plains of northeast Colorado. * WHEN...From late Monday night through early Tuesday morning. * 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. && $$ For more information from the National Weather Service, visit https://weather.gov/bou 63 Action: Upgraded 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. && $$ For more information from the National Weather Service, visit https://weather.gov/bou 20 Action: Upgraded Issued At: 2026-05-18 12:37:19 089 WWUS75 KBOU 181736 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 1136 AM MDT Mon May 18 2026 COZ039-040-181845- /O.CAN.KBOU.FZ.A.0003.260519T0600Z-260519T1400Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Including the cities of Denver International Airport, Parker, Longmont, Boulder, Lakewood, Brighton, Arvada, Aurora, Highlands Ranch, Golden, Littleton, and City of Denver 1136 AM MDT Mon May 18 2026 ...FREEZE WATCH IS CANCELLED... Temperatures will be cold tonight, but should hover just above freezing over most of Denver due to expected cloud cover. $$ 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: Cancelled 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||