Originally Posted by
mareh
I think Bob's clam hut in Kittery is open year round, although that's an hour from Portland. (Their food is really good though.) You really have to look up the individual places you're interested in.
The farther you roam from Portland, the quieter it's going to be before May and after Labor Day. In Boothbay Harbor, where Mom retired, we used to visit in mid-April and the place was dead as a doornail -- might as well have been January. Same for post-September 15. If you visit out of season you might be well-advised to stay and eat in Portland, which is lively year-round, and do daytrips into the quiet surrounding regions.