Met Éireann has issued a Status Orange low temperature warning from 9 tonight until 10 tomorrow morning.
Lows of -4 to -6 are forecast for the Premier County.
While most main roads in Tipp will be gritted by the local authority motorists are advised to exercise caution.
The warning covers all of Munster, Connaught and Leinster as well as Donegal, Monaghan and Cavan.
