The midlands and the majority of the country will come under the weather warning at 6pm.
The midlands could see temperatures dip as low as minus five degrees this evening.
A yellow weather warning for low temperatures is in place for Westmeath, Offaly, and Laois, as well as the majority of the rest of the country.
The onset of ice from 6pm this evening is likely to bring hazardous travelling conditions.
Alan O'Reilly of Carlow Weather says the conditions will be slow to change as well: