Road users are being urged to take care as temperatures are set to plummet tomorrow evening with a Status Yellow warning for ice issued for 18 counties and all of Connacht.
The Road Safety Authority said the low temperatures will lead to hazardous conditions on roads and footpaths.
Met Éireann said the warning will come into effect at 6pm tomorrow for Carlow, Kildare, Kilkenny, Laois, Longford, Louth, Meath, Offaly, Westmeath, Wicklow, Cavan, Donegal, Monaghan, Clare, Cork, Kerry, Limerick, Tipperary and Connacht.
The forecaster said it will be very cold with temperatures expected to fall below -3C in some areas, and frost and ice developing.
The warning will remain in effect until midday on Friday.
Met Éireann said the weather will become increasingly colder over the next few days, with night time temperatures below freezing in many areas along with wintry showers in places.
It said that current conditions suggest that Monday and Tuesday will continue cold, but mainly dry.
Separately, the UK Met Office has issued a Yellow ice warning for Antrim, Armagh, Down, Tyrone and Derry from 5pm this evening until 10am tomorrow.
It said that icy patches may cause difficult driving conditions.