A weather warning is in place for Connacht, Cavan, Monaghan and Donegal tonight.
According to Met Éireann, temperatures will fall to between -2 and -4 degrees in the affected areas.
The status yellow warning came into effect at 7pm, and is in place until 10am tomorrow morning.
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Forecasters are warning that there will also be widespread severe frost in the north and northwest tonight.
Elsewhere, lowest temperatures will fall to around -1 to +3 degrees with some frost.