The National Weather Service has now issued a Freeze Warning for the interior valleys of western Carbon and Albany counties, including the city of Laramie. The Warning is in effect Friday night (September 20) through Saturday morning. 

Overnight temperatures are expected to drop below freezing early Saturday morning. A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation.

URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
259 AM MDT Fri Sep 20 2019

...FREEZE WARNING IN EFFECT FOR THE INTERIOR VALLEYS OF WESTERN 
CARBON AND ALBANY COUNTIES SATURDAY MORNING...

.Cold overnight temperatures are expected Friday night through
early Saturday across far western Carbon and Albany Counties.
Overnight lows will drop below freezing with some wind sheltered 
locations dipping to the upper 20s. Sensitive plants and crops may
be killed by frost.

WYZ111-113-115-211500-
/O.UPG.KCYS.FZ.A.0002.190921T0600Z-190921T1500Z/
/O.NEW.KCYS.FZ.W.0002.190921T0600Z-190921T1500Z/
Southwest Carbon County-Upper North Platte River Basin-
Laramie Valley-
Including the cities of Baggs, Saratoga, Encampment, Bosler, 
and Laramie
259 AM MDT Fri Sep 20 2019

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT
SATURDAY...

The National Weather Service in Cheyenne has issued a Freeze
Warning, which is in effect from midnight tonight to 9 AM MDT
Saturday.  

* TIMING...Midnight Friday night through 9 am Saturday Morning

* TEMPERATURE...Overnight lows between 26 and 30 degrees
  Fahrenheit.

* IMPACTS...Plants or sensitive crops may be killed by frost. Non-
  insulated water lines may freeze. 

 

MORE: Farmer’s Almanac Predicts September Snow For Southeastern Wyoming