A freeze watch is in effect for the greater Phoenix area and north-central Pinal County from late Thursday night through Friday morning.
The National Weather Service says a cold front will sweep across the deserts Thanksgiving Day and will usher in some of the coldest temperatures so far this season.
Clearing skies, drier air and light winds will mean freezing conditions for parts of south-central Arizona Thursday night into early Friday morning.
Areas covered by the warning include Mesa, Chandler, Queen Creek, Goodyear, Avondale, Maricopa and Coolidge.
Temperatures will likely drop to 32 degrees for several hours with minimums between 24 and 28 degrees.
A freeze watch means subfreezing temperatures are possible which could destroy or damage crops and other sensitive vegetation.