You can get lobster here any time. I'm no expert, but there are times of year when you only get soft-shell versus the hard-shell. I'm not that well-versed on the subject becuase (gasp) I'm not terribly fond of it.

I know, I know, living here in the middle of all that lobster and not eating it is kind of strange. I'm glad they sell a lot of it, though, cuz it keeps people employed hereabouts.
But yes, you can get lobster here pretty much whenever you like.
It does get cold here now through April. During the summer we get overrun with what we call "people from away", as Acadia National Park is here, and Bar Harbor is a bit of a tourist attraction as well.
We'll set you up with a place to get lobster no matter when you come this way!