First: in-park or private?
The National Park Service runs four campgrounds inside Acadia National Park, and they are a genuinely different product from anything commercial — no hookups, no pool, no store worth the name, but you wake up inside the park boundary. They also release on a booking window that fills within minutes for peak dates. That whole system is covered in our guide to camping in Acadia.
Private campgrounds exist because that system does not have enough sites, and because plenty of people want a shower with unlimited hot water, a laundry, a swimming pool and a full hookup for a 38-foot rig. If any of those matter to you, stop trying to win the in-park lottery and book one of the places below.
The geography, which is the whole decision
Everything reaching Mount Desert Island crosses one causeway at Trenton. Campgrounds fall into three bands:
- On the island — Route 3 between the causeway and town, plus a few inland. Ten to twenty minutes to a park entrance. Most are on the Island Explorer shuttle network.
- Trenton, mainland side of the causeway — bigger sites, more space per dollar, roughly twenty-five to thirty-five minutes to the Park Loop Road, and you cross the traffic pinch point twice a day.
- Further out, toward Ellsworth and Lamoine — quietest and cheapest, forty minutes or more each way.
In July and August that causeway backs up in the morning and again around dinner. If your plan involves an early trailhead or a Cadillac Mountain (4.9 from 1,528 reviews) reservation, being on the island is worth real money.
On-island campgrounds
Bar Harbor/Oceanside KOA at Salsbury Cove is the best-known commercial site on the island, with about 3,500 feet of shoreline and westward-facing water views that make it the sunset pick. It runs the full KOA format — RV sites with hookups, deluxe cabins, camping cabins and tent sites — and it books further ahead than almost anywhere else here. There is a second KOA inland, in the woods, which is easier to get into and has no view.
Mt. Desert Narrows Camping Resort sits on the shoreline of the Narrows just past the causeway, with sites right along the water and the same resort-style amenities. It is the closest thing to a waterfront RV park on the island.
Hadley's Point Campground has been run by the same family since 1969 and is the traditional, wooded, less-commercial option — tent sites, water-and-electric sites, full hookups and cabins, a short walk from Hadley Point Beach (4.7 from 109 reviews). It is the one longtime visitors keep going back to.
Bar Harbor Campground on Route 3 is close to town, has an Island Explorer stop, and offers everything from dry tent sites to full hookups. Check its current reservation policy directly — it has changed in recent years.
Mount Desert Campground in Somesville is the one to want if you are in a tent. It sits at the head of Somes Sound, most sites are on raised wooden platforms because the ground is rock and root, and there is a dock with kayak and canoe rentals. Large RVs are not the point here and are limited by design. It is the quietest campground on the island and the hardest to book.
Trenton and the Route 3 corridor
Timberland Acres RV Park in Trenton is the big-rig answer: around 200 sites on 35 acres of woods, paved roads, more than eighty full-hookup pull-throughs with fifty-amp service, a heated pool, a dog park and a playground. If you are towing something long and want to arrive without a three-point turn, this is the sensible booking.
Narrows Too Camping Resort, also in Trenton, sits on the water side with ocean views from many sites and rents cabins and yurts alongside tent and RV sites. A heated pool, trails and an entertainment building make it the family-resort option rather than the nature option.
Further along, Lamoine State Park (4.6 from 486 reviews) is the outlier worth knowing: a state-run campground on Frenchman Bay, well east of the causeway, with a boat launch and a beach and none of the Route 3 commercial noise. It is about forty minutes to the Park Loop Road, and the trade is a much calmer place to come back to.
Which one suits you
| Campground | Where | Drive to the park | Best for |
|---|
| Bar Harbor/Oceanside KOA | Salsbury Cove, on-island | Short | Waterfront sites, cabins, full amenities |
| Mt. Desert Narrows | On-island, at the Narrows | Short | Shoreline RV sites |
| Hadley's Point | On-island, wooded | Short | Traditional family camping, mixed sites |
| Mount Desert Campground | Somesville | Medium | Tents, platforms, kayaking, quiet |
| Timberland Acres | Trenton | Medium | Large RVs and long pull-throughs |
| Narrows Too | Trenton | Medium | Cabins, yurts, pool, families |
| Lamoine State Park | Lamoine | Long | Quiet, bayside, low cost |
The shuttle question
The Island Explorer is fare-free, runs a summer-into-autumn season, and stops at several campgrounds along Route 3 on the island. That is a bigger deal than it sounds: trailhead lots at Sand Beach (4.8 from 970 reviews), the Beehive Trail (4.9 from 583 reviews) and Jordan Pond fill by mid-morning in August, and a bus takes that problem away entirely. Confirm the stop before you book if it matters to you — coverage does not extend to every site, and it does not reach the Trenton campgrounds.
What a campsite here does not solve
Two honest warnings. First, almost every private campground on this stretch is off Route 3, which carries the island's entire traffic load; sites near the road hear it, and "wooded setting" in a listing does not always mean quiet. Ask for a site well back from the entrance when you book.
Second, none of these places puts you within walking distance of dinner in Bar Harbor. You are driving or shuttling into town, and in August that means competing for the same parking as everyone else. Plan evenings around cooking on site, or eat early. Our roundup of things to do in Bar Harbor covers which restaurants take the pressure off.
When to book
Peak weeks — roughly the second week of July through Labor Day, plus the first two weeks of October for foliage — go months ahead, and the waterfront sites at the popular places go first. Shoulder season is a completely different experience: late May, early June and the second half of September are all comfortable camping, and you can often book a good site a week out.
Two practical notes. Do your real grocery run in Ellsworth on the way in, because it is the last full-size supermarket before the island and prices climb once you cross. And if the appeal of camping is mostly the setting rather than the gear, compare against the canvas-and-yurt properties in our guide to glamping near Acadia before you decide.
Frequently asked questions
Which Bar Harbor campground is closest to Acadia National Park?
The campgrounds along Route 3 on Mount Desert Island — Bar Harbor Campground, Mt. Desert Narrows, Hadley's Point and the Oceanside KOA — are all within about fifteen minutes of a park entrance, and several sit on the Island Explorer shuttle route. Anything in Trenton adds the causeway crossing, which is fine at 7 a.m. and slow at noon in August.
Can you camp in Bar Harbor without a reservation?
Not reliably in summer. Reservation policies vary by campground and one or two have historically taken walk-ins, but arriving in July or August without a booking and expecting a site is a bad plan. Shoulder season is different — late spring and late September usually have availability within a few days' notice.
Are there tent-only campgrounds near Bar Harbor?
Mount Desert Campground in Somesville is the closest thing: raised tent platforms, a wooded setting on Somes Sound, and limits that keep large RVs out. Most other private campgrounds in the area accept both tents and RVs, which means generators and hookup pedestals among the tent sites. Inside the park, Blackwoods and Seawall both have tent-only loops.
Do Bar Harbor campgrounds have hookups and showers?
Yes — that is the main reason to choose a private campground over an in-park one. Expect full hookups on at least some sites, plus bathhouses with hot showers, laundry, a camp store and often a heated pool. The four National Park Service campgrounds inside Acadia have none of that, which is exactly the trade-off you are making.
