Yes, best to let marinas know and they'll give you an idea of when they'll be scheduling work in the spring. You'll then need to coordinate dropping the boat off and a launch or launch-ready date.
I try to schedule spring launch mid-week, Monday through Thursday as everyone wants a Friday-Sunday launch. I find marinas are much more open during those times. Dropping a boat off shouldn't be as much of a concern but marinas get very busy in the spring. I can see your boat getting "lost" in the shuffle if you drop it off on a busy weekend.
If you don't have a date scheduled by April 1st then you'll find dates start to get booked and you may not get your first choice.
Edit: Oh and congratulations on the boat!
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Boat #3: Premier Sunsation 220 Tritoon
Boating on Winnipesaukee since 1989
Vacationing on Winnipesaukee since 1975
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