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.
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The warning covers all of Munster, Connaught and Leinster as well as Donegal, Monaghan and Cavan.