It'll come into effect from this evening.
A Status Yellow Low Temperature/Ice warning has been issued for all of Connacht, Cavan, Monaghan, Donegal, Longford and Clare.
The alert will come in to effect at 6 o'clock this evening and is set to last until 10am tomorrow.
Met Eireann is forecasting temperatures will drop to between -2 and -5 degrees overnight. There will be widespread severe frost and icy patches on untreated surfaces.
Meanwhile, the UK Met Office has also issued an ice warning for counties Antrim, Armagh, Down and Tyrone.
They predict icy conditions will cause difficult driving conditions. That warning is valid from 4pm today until 10am on Wednesday.