Temperatures are set to plummet to minus 2C tonight with the Met Office warning of freezing fog patches.
Widespread frost is also set to hit Northern Ireland , with salting due to take place.
For tonight, the Met Office say: "It will be dry and cold tonight with some long clear spells and light east to northeast winds.
"Temperatures will fall to between -2 and +2 degrees, with a widespread frost and a few mist and fog patches developing overnight."
Trafficwatch NI urged motorists to take caution when driving on untreated roads, saying: "Temperatures forecast to fall below freezing - risk of ice on roads.
"Salting of roads on scheduled network considered at risk planned for Thursday evening."
And for tomorrow, the Met Office said: "Friday will be dry and cold with some bright or sunny spells.
"After a very chilly start, highest afternoon temperatures will reach 5 or 6 degrees in light or moderate, easterly winds."
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