That is a tough call but I suspect you better wait to see for sure. Sometimes on such tropical plants as those if the freeze was light and brief the leaves and outer branches are killed but the plant will later resprout from the trunk or main branches. Maybe even the base of the trunk at the ground line will resprout, so I would wait until the weather warms up next spring to decide for sure. At that time you can scratch back the outer bark with a thumbnail to see if it is living (creamy to green colored) or dead (pecan brown to black).
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