Temperatures reached -6.6 degrees in Mount Dillon, Co Roscommon at 4am and -6.3 degrees in Cavan at 6am.
While an orange low temperature and ice warning for most of the country is no longer in place, a yellow warning is still in place until 12pm on Friday for the entire country.
Met Éireann said it will be very cold with widespread frost, ice and lying snow as well as some patches of freezing fog.
Potential Impacts include: hazardous travelling conditions on roads and underfoot, travel disruption and poor visibility.
The yellow warning is valid up until 12pm on Friday with the worst of the cold snap looking to be behind us.
The Warnings have been updated, including new regions: Donegal and Leitrim.
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Met Éireann said it will be very cold across most of the country on Friday, with widespread frost and ice or black ice.
Cloud and rain in the southwest will slowly move northeast through the day, turning to sleet for a time with snow on high ground.
It will stay dry in Ulster and north Leinster. Highest temperatures of 1 to 5 degrees generally but not as cold in the southwest with moderate to fresh east to southeast winds developing.
Saturday will be generally cloudy with scattered outbreaks of light rain and drizzle. Scattered showers will spread across the south and southwest during the afternoon and evening.
Highest temperatures of 3 to 7 degrees, milder near south and west coasts, in light to moderate southerly winds.
They said it will gradually become milder through the weekend. Becoming dull with rain and drizzle at times early next week.
On Sunday it will be overcast with patchy outbreaks of rain and drizzle developing over the western half of the country.
Staying dry further east. Gradually turning milder through the day with afternoon temperatures of 6 to 10 degrees in moderate to fresh southerly winds
