The storm has blanketed parts of the U.S. from Maryland to New York.
Some areas have reported as much as 25 centimetres of snow.
The system is expected to move into parts of Atlantic Canada on Sunday.
The unusually early snowstorm bringing heavy, wet snow to the east coast has knocked out power to more than 1.7 million customers in the U.S.
Half a million are without power in New Jersey, including Gov. Chris Christie, who declared a state of emergency Saturday.