Simply check with your local marina. They'll dictate when you can launch.
Here on the eastern shores near Grand Haven/Muskegon, late April is not too early in most years. Storms can occur any time of the year so you'll have to be prepared for storms in June/July/August/Sept anyway, so just make sure she's secure in the slip and battened down.
While the water in the big lake won't warm up reasonably until late June or sometime in July, there's some great early season sailing to be had.
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