Forecasters expect sub-zero temperatures for anything up to a week.
People in the Midlands can expect an "intense" cold spell with the potential for snow in the coming days.
Met Éireann says temperatures could drop to minus four degrees tonight, while some falls of sleet and snow are possible over the coming days.
It's expected to be mostly dry but very cold on Saturday and Sunday, while the colder conditions are predicted to last into next week.
Offaly's Cathal Nolan from Ireland's Weather Channel says a proper cold snap is coming:
While Alan O'Reilly from Carlow Weather says for now, the snow risk for most areas is quite low:
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