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

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