For most Maine trips, yes, a car is the most practical thing you can have. Here is where that holds true, where it does not, and what to know before you rent.
The Short Answer: Yes, for Almost Every Trip
Maine is large. The state runs about 320 miles from Kittery at the New Hampshire line to Fort Kent on the Canadian border, and the coastal road, Route 1, is a two-lane highway that crawls in July and August. There is no regional rail service north of Brunswick. There is no meaningful bus network connecting the harbor towns. If your trip includes Acadia, Kennebunkport, Camden, Boothbay Harbor, or anything in the western mountains, you need a car.
The good news: Maine is not hard to drive. Outside of a few summer bottlenecks and the Bar Harbor parking situation, the roads are clear, the distances are manageable, and most of the places worth visiting sit right off Route 1 or a short spur from it. Our full guide to getting around Maine covers drive times between regions, ferry routes, and the specific stretches of Route 1 that slow down the most. For first-time visitors building a Maine trip from scratch, the Maine Travel Guide is a good place to start before you figure out logistics.
The short version of who does not need a car: someone spending their entire trip in Portland, or someone visiting Acadia who is willing to stay in Bar Harbor and use the free Island Explorer shuttle. Everyone else should rent.
Portland: Where a Car Is Genuinely Optional
Portland is the one place in Maine where you can arrive by train and spend several days without renting anything. The Amtrak Downeaster runs from Boston’s North Station to Portland Union Station on Thompsons Point Road, with five or six daily departures and a travel time of about two hours and 30 minutes. Tickets start around $30 each way if you book a week or more ahead. From Portland Union Station, it is a 10-minute cab or rideshare to the Old Port.
Once you are in the Old Port, the city is walkable. Congress Street, the Portland Museum of Art, the Eastern Promenade, and the ferry terminal for Casco Bay Lines are all within a mile or two of each other. Casco Bay Lines runs regular ferries to Peaks Island, the most-visited of the offshore islands, in about 20 minutes, and you can rent a bike on Peaks for $20 to $30 for the day and ride the whole island in a few hours. The ferry schedule runs from early morning to late evening in summer, so it is an easy day trip from the Old Port.
The one catch: Portland Head Light in Cape Elizabeth, probably the most-visited lighthouse in Maine, is 15 minutes south by car and has no transit connection. If Portland Head Light is on your list, you either rent a car for a half day or book a guided tour that includes it. For trip planning around timing and seasons, the best time to visit Maine page breaks down what each season looks like across the state.
Acadia: Easier Without a Car Than You Might Expect
Acadia National Park runs one of the better free transit systems of any national park in the country. The Island Explorer shuttle operates from late June through Columbus Day across seven routes covering most of Mount Desert Island: Bar Harbor, Eagle Lake, Jordan Pond, Sand Beach, Thunder Hole, Southwest Harbor, Northeast Harbor, and the ferry terminal for the Cranberry Isles. If you base yourself in Bar Harbor and ride the Island Explorer, you can reach most of the park’s major trailheads and viewpoints without driving at all.
That said, the system has real limits. Mid-week in September, some routes run once an hour, and the quieter western side of the island, trailheads like Acadia Mountain and Flying Mountain off Route 102, see less frequent service. The park also requires a timed vehicle reservation to drive Cadillac Summit Road from late May through late October, released 90 days out and again two days before the date. If your whole reason for coming to Acadia is the Cadillac Mountain sunrise, you need either a car with a timed reservation or a sunrise tour booked through a Bar Harbor operator. Our post on watching the sunrise on Cadillac Mountain covers how the reservation system works and the best time windows to aim for.
Bottom line on Acadia: if you stay in Bar Harbor and stick to the main park attractions, a car is not required. If you want to reach the western quieter side of the island, the Schoodic Peninsula across Frenchman Bay, or the Cranberry Isles by your own schedule, you need wheels.
The Rest of the Maine Coast: No Useful Alternatives
North of Brunswick, the Amtrak Downeaster ends. There is no train to Kennebunkport, no bus to Camden, no shuttle to Boothbay Harbor. Kennebunkport sits about 90 minutes north of Boston Logan (BOS) on I-95 to Route 9, and roughly 35 miles south of Portland, an easy drive, but a car-only destination. Camden is about two hours north of Portland via Route 1 in summer, longer if you hit the Bath Bridge or the Wiscasset bottleneck (that single-lane stretch through Wiscasset adds 20 to 40 minutes in peak July and August traffic, and there is not much you can do about it).
Boothbay Harbor sits at the far end of a 10-mile peninsula off Route 1. No transit reaches it. Rockland, Ellsworth, and the stretch from the MidCoast to the Acadia area run about 90 miles along US-1 with no bus service. If you want the lobster shacks, the harbor towns, and the scenery between Portland and Acadia, you drive it.
Families traveling with kids will find the car even more essential, beach gear, nap schedules, and spontaneous stops at roadside lobster pounds do not work on shuttle timing. Our guide to Maine with kids covers which coastal stretches work best for families and which towns have the most to do without constant re-parking.
Car Rental Tips for Maine
Portland International Jetport (PWM) and Bangor International (BGR) both have major rental agencies on-site: Hertz, Avis, Enterprise, Budget, and National are represented at PWM. If you fly into Boston Logan (BOS), which many visitors do for better flight prices, you can rent in Boston and drive up, but return it in Maine if your return flight leaves from PWM or BGR. Dropping a Boston-originating rental at a Maine airport typically triggers a one-way fee of $150 or more. Some agencies waive this with advance notice; ask before you book.
Reserve early. The Maine rental market is thin, and summer, mid-June through Labor Day, runs short on inventory fast. Compact car rates that run $55 to $75 per day in May can hit $120 to $180 per day on last-minute July bookings. Sixty days out is not too early for a July trip. If you are arriving at Bangor (BGR) for Acadia, the selection is smaller than Portland but the airport is about 60 miles and an hour from Bar Harbor, which saves time compared to flying into PWM and driving the full 165 miles.
Bar Harbor parking in summer is one of the more frustrating logistics problems on the Maine coast. The town fills up fast from late June through Labor Day. The best move is the free park-and-ride lot on ME-233 near Eagle Lake Road, about three miles west of downtown Bar Harbor. You leave your car there and take the Island Explorer Route 1 directly into town. It saves the circling and eliminates the meter anxiety.
Practical Tips
If you are renting for part of your trip, say, picking up a car in Portland to drive the coast after a carless day or two in the city, make sure your itinerary allows time for the slower coastal pace. Route 1 in summer is not a highway. Plan on 45 to 60 miles per hour as an average, not 65.
Gas stations thin out once you leave the main coastal corridor. Fill up before heading to Baxter State Park or the Moosehead Lake area, Greenville is the last reliable fuel stop before the remote interior, and the drive from I-95 to Greenville is about 70 miles of two-lane roads through Guilford and Monson. The western mountains have fuel in Bethel and Rangeley, but not much in between.
If you are deciding between visiting in summer versus fall, car logistics shift a bit: fall traffic on Route 1 is lighter than July and August, rental prices drop after Labor Day, and parking in Bar Harbor is no longer the fight it is in peak summer. Fall is also when the interior roads and mountain areas are at their most appealing. The full breakdown is on our best time to visit Maine page.
Frequently asked questions
Can you visit Acadia National Park without a car?
Yes, with some trade-offs. The free Island Explorer shuttle runs from late June through Columbus Day and covers most of the park’s major destinations from a Bar Harbor base. However, driving Cadillac Summit Road requires a timed vehicle reservation regardless, the western side of Mount Desert Island has less frequent service, and the Schoodic Peninsula across the bay requires either a car or a passenger ferry from Bar Harbor. If your trip is limited to the main loop, Sand Beach, Thunder Hole, Jordan Pond, and the Bar Harbor area, the Island Explorer works well.
Is there a bus or train from Boston to Bar Harbor?
Not a direct one. The Amtrak Downeaster runs Boston North Station to Brunswick (about two hours and 30 minutes to Portland, another 30 minutes to Brunswick), but it does not continue east. From Brunswick, there is no reliable transit connection to Bar Harbor, which is another 160 miles by road. The most practical car-free approach from Boston is to fly into Bangor (BGR), about 60 miles from Bar Harbor, and rent there. Some visitors take the Downeaster to Portland, rent a car in Portland, and drive the four-hour coastal route up through the MidCoast.
Do I need a car if I am only visiting Portland, Maine?
Not for the city itself. Portland is walkable between the Old Port, Congress Street, and the waterfront, and the Casco Bay Lines ferry to Peaks Island is an easy car-free day trip. The Amtrak Downeaster connects Boston and Portland with several daily runs. If you want to reach Portland Head Light in Cape Elizabeth, Freeport, or Kennebunkport, you will need a car or a guided tour, none of those have transit connections.
When should I book a rental car for a Maine summer trip?
At least 60 days before your trip for July and August travel, and 30 days out for June and September. The Maine rental market is small, and peak-season demand from out-of-state visitors routinely outpaces supply. Last-minute summer rentals at Portland or Bangor airports can run $120 to $180 per day for a compact, sometimes more. Booking through a major agency (Hertz, Avis, Enterprise) directly and checking prices on a comparison site like Kayak or Expedia together will usually surface the best rate.
