Probably not. It just melts and runs away. Or if the temp for some reason stayed below freezing it would eventually evaporate (sublimate?) straight from ice. In the end it is just water. The only ways that ice causes damage to weatherproof things is by loading them too heavily, or by getting into spaces where the expansion from liquid bursts something.
Although people in cold climates normally remove sails and cover their boats, many don't bother and it doesn't seem to hurt them too badly. The sun and wind do more damage I think. (This opinion comes from 30 years in southern ontario.)
edit: It just occurred to me that you may not have winterized your engine or water systems on board. If not, sustained freezing temps may burst pipes and or hoses and damage pumps. I hope not!
Last edited by yotphix; 02-14-2007 at 02:23 AM.