Depends on the temperature of the basement. Heat from the water will be always trying to escape to the cold. If losses because the basement is too cool outpace available heat removed they will freeze.

In most cases they seem satisfacory. Do not insulate the pipe inside the house that feeds them. You want the pipe to pick up the ambient heat. If the part going through the wall or foundation where something other than metal the thermal conduction loss would be far less.