Maine has 5 National Park Service units, and the one that matters most is Acadia National Park. It is the only full national park in the state, the first national park east of the Mississippi, and the reason most people come to Maine in the first place.
My brother and I have filmed all over Maine, and Acadia is one of those places that lives up to the hype and then some. Pink granite mountains drop straight into the Atlantic, you can stand on Cadillac Mountain and be among the first people in the country to see the sunrise, and the carriage roads give you 45 miles of car-free cycling through the woods. But Maine has more than Acadia, including a young national monument in the North Woods and the northern end of the Appalachian Trail.
A note on the count, because this is where Maine lists usually go sideways. Maine has 5 genuine NPS units. The state page also folds in Maine Acadian Culture, which is a partnership program rather than a standalone unit, and Roosevelt Campobello, which is an affiliated area that physically sits on an island in Canada. I keep the count honest at five, and I flag the two partnership entries so you know what they are. Note also that Frances Perkins became Maine’s newest national monument in late 2024.
Maine National Park Sites Compared
| Site | Designation | The Draw | 2026 Fee |
|---|---|---|---|
| Acadia | National Park | Cadillac Mountain sunrise, carriage roads, the rocky coast | $35 per vehicle |
| Katahdin Woods and Waters | National Monument | North Woods wilderness, dark skies, views of Mount Katahdin | Free |
| Appalachian Trail | National Scenic Trail | The northern terminus at Katahdin, the famous 100-Mile Wilderness | Free |
| Frances Perkins | National Monument | The homestead of the first woman Cabinet secretary, designated 2024 | Free |
| Saint Croix Island | International Historic Site | The 1604 French settlement, the only site of its kind in the system | Free |
On fees, Acadia is the only unit that charges, at $35 per vehicle for a seven-day pass, and it also requires a separate timed-entry reservation to drive up Cadillac Mountain in season. Everything else in the state is free. The $80 America the Beautiful annual pass covers Acadia and pays for itself in about three park visits. Note that Acadia added a surcharge for non-US visitors in late 2025.
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1. Acadia National Park
The best site in the state, and it is not close. Acadia sits mostly on Mount Desert Island, where the mountains of the Atlantic coast end and drop into the sea, and it packs a remarkable amount of variety into a relatively small park.
Start with Cadillac Mountain, the highest point on the eastern seaboard, where from early October through early March you can be among the first people in the country to watch the sun come up. Below it run the carriage roads, 45 miles of broken-stone paths John D. Rockefeller Jr. built for horses and now perfect for cycling. The Park Loop Road strings together Sand Beach, Thunder Hole, and Jordan Pond, and the harder trails like the Precipice and the Beehive use iron rungs to climb the cliffs. The entrance fee is $35 per vehicle.
Go in September and early October if you can. The summer crowds thin out, the fall color comes in, and the air sharpens. For a full plan, see our guide to the best things to do in Acadia and our Acadia facts.
2. Katahdin Woods and Waters National Monument
The wild heart of the North Woods, and one of the best dark-sky sites in the East. Katahdin Woods and Waters protects 87,000 acres of forest, river, and mountain on the eastern side of Baxter State Park, donated to the country and made a monument in 2016.
This is undeveloped country. The main attraction is the loop road with overlooks toward Mount Katahdin, the East Branch of the Penobscot River for paddling, and miles of trails that see almost no one. In 2020 it was named an International Dark Sky Sanctuary, one of the few in the eastern United States, so a clear night here is worth staying up for. Entry is free, the roads are rough, and services are scarce, so come prepared.
3. Appalachian National Scenic Trail
The end of the line for every northbound thru-hiker. The Appalachian National Scenic Trail runs 2,190 miles from Georgia to Maine, and its northern terminus is the summit of Mount Katahdin, the hardest and most emotional finish in American long-distance hiking.
The Maine stretch is the wildest and most demanding of the whole trail. The 100-Mile Wilderness, the final unbroken run before Katahdin, has no road crossings and no resupply, which is why hikers stagger out of it. You do not need to thru-hike to taste it. Day hikes off Route 15 and around Monson get you onto the trail, and the climb up Katahdin from Baxter State Park is one of the great single-day hikes in the East. The trail is free.
4. Frances Perkins National Monument
Maine’s newest unit, and one of the most overdue honors in the system. Designated in December 2024, the Frances Perkins National Monument preserves the Newcastle homestead of the first woman to serve in a presidential Cabinet.
As Franklin Roosevelt’s Secretary of Labor for all 12 years of his presidency, Perkins was the architect of Social Security, the minimum wage, and the 40-hour week, which makes her one of the most consequential public servants in American history. The 57-acre homestead on the Damariscotta River was the family seat she returned to all her life. The site is new and still developing visitor services, with guided access. Admission is free. It is a worthwhile detour on the midcoast.
5. Saint Croix Island International Historic Site
The only international historic site in the entire National Park System. On the St. Croix River that forms the border with Canada, this site marks the 1604 French attempt to settle the New World, three years before Jamestown.
The settlement was a disaster. Nearly half the 79 men died of scurvy over a brutal first winter on the small island, and the survivors moved on the next year to found what became Acadia in Canada. The island itself is closed to protect the archaeology, but the mainland interpretive trail tells the story with bronze statues and river views. It is free, and a quiet, sobering stop in far Downeast Maine.
Two Partnership Sites Often Listed With Maine’s Parks
Two entries show up on Maine’s NPS state page that are not standalone units, and it is worth knowing the difference. Maine Acadian Culture is a partnership program supported through Acadia that helps preserve the language and traditions of the St. John Valley, not a place you visit with a gate and a sign. Roosevelt Campobello International Park preserves Franklin Roosevelt’s summer cottage, but it physically sits on Campobello Island in New Brunswick, Canada, and is run by a joint US and Canadian commission rather than the Park Service. You reach it by crossing the bridge from Lubec, the easternmost town in the United States, and you will need a passport.
A couple of places people expect to find on a Maine parks list are not NPS at all. Baxter State Park, which holds Mount Katahdin itself, is a Maine state park, separate from the adjacent Katahdin Woods and Waters monument. The White Mountain National Forest, which crosses into western Maine, is run by the Forest Service.
How to Plan a Maine National Parks Trip
Most Maine trips revolve around Acadia, and rightly so. Give it three to four days, base in Bar Harbor, and you can ride the carriage roads, hike the cliffs, and catch a Cadillac sunrise. From there the state splits north and south. The North Woods loop adds Katahdin Woods and Waters and the Appalachian Trail around Baxter, a long drive but a true escape. The midcoast on the way up holds the new Frances Perkins monument, and the far Downeast corner past Acadia leads to Saint Croix Island and the Campobello crossing.
September is the sweet spot, with thinner crowds and the first fall color. July and August are beautiful but busy, and winter shuts most of Acadia’s roads. If you are building a wider New England trip, Maine pairs with the parks of New Hampshire and Vermont to the west. For the bigger picture, our guide to the best national parks puts Acadia in national context.
The bottom line
Acadia is one of the finest national parks in the East, and it alone justifies the trip to Maine. But the state has quietly built out its NPS roster with a wilderness monument in the North Woods, the end of the Appalachian Trail, and a long-overdue monument to Frances Perkins. Go for Acadia, and give yourself an extra day or two to see the rest of what Maine protects.
