The Mountain Road will stay closed until further notice.
The Department of Infrastructure says it had gritters and snow ploughs working on the road yesterday.
But work was undone by the weather conditions throughout the day.
The department says it will re-asses whether it can open the road this morning.
Difficult to compare Island's Hospice funding with UK, says minister
New amber warning issued for tonight's storm
Police appeal over theft of building materials
One of capital's oldest buildings may become housing
New NHS safety rule to be brought in on Island
Two city streets to shut for over six months
Revamp of airport terminal planned, says DOI