Almost every county in the country will be impacted.
A Status Yellow low temperature and ice warning has been issued for much of the country.
Laois, Offaly and Westmeath, as well as almost every other county with the exception of Dublin, Wexford and Waterford, will be under the alert.
It's in effect from 6pm tomorrow evening and will continue until midday on Friday.
Met Éireann is warning of lows of -3 degrees in places, with frost and ice causing hazardous travel conditions.