Acadia National Park closes summit road on 9 November

Acadia National Park has closed Cadillac Summit Road for construction from 9 to 25 November 2026, a restriction that affects access to Cadillac Mountain in Bar Harbor, United States. The road will close again from 1 to 18 December 2026, while the mountain’s hiking trails remain open.

Cadillac Summit Road closure covers two periods

The construction resumed on 9 November to complete an accessible pedestrian path between the East and West parking lots at the summit. The Bar Harbor construction alert states that Cadillac Summit Road is closed to all users, including bicyclists and pedestrians, during both periods.

The restriction changes how visitors reach the summit during the affected dates. The town notice says hiking trails on Cadillac Mountain remain open, so the road itself is unavailable but trail access continues. Park Loop Road is also due to close to motor vehicles for the season on 1 December 2026, according to the same notice.

Construction meets Cadillac Mountain history

Cadillac Mountain is the highest point on the eastern seaboard of the United States. The National Park Service records the summit at 1,530 feet (466 metres), and describes the present road as a 3.5-mile (5.6-kilometre) paved route constructed from 1924 to 1931.

The current work links a practical access change with an established feature of the summit. The National Park Service summit information identifies the parking area, paved summit loop, waysides and facilities at the top. During the closure periods, visitors therefore need to distinguish the closed summit road from the hiking routes on the mountain.

Cadillac Mountain also sits within a wider landscape shaped by transport infrastructure. The park’s carriage roads extend for 45 miles and were constructed between 1913 and 1940 with support from John D. Rockefeller Jr. and his family. Their drainage ditches, stone culverts and retaining walls were designed for the wet conditions of Maine.

Winter access extends beyond the summit road

The summit restriction is part of a broader seasonal change rather than a closure of the entire park. The National Park Service describes Acadia as a place with motor roads, hiking trails and carriage roads serving different forms of access. That distinction matters in November and December, when a closed road does not automatically mean a closed mountain.

Cadillac Summit Road is located off Park Loop Road and has no public transport service to the summit. The mountain’s exposed granite, steep sections and rapidly changing coastal weather make conditions different from those in Bar Harbor. The park service advises visitors to stay on designated paths and follow posted safety notices.

Visiting Acadia National Park: what travellers from Western Europe should know

• The Cadillac Summit Road closure runs from 9 to 25 November 2026 and returns from 1 to 18 December 2026 for construction at the summit.
• The road is closed to vehicles, bicycles and pedestrians during those periods, but hiking trails on Cadillac Mountain remain open.
• Cadillac Mountain is reached from Park Loop Road, and the summit road is a 3.5-mile (5.6-kilometre) paved route with no public transport service.
• The summit reaches 466 metres (1,530 feet), with exposed granite, steep trail sections and quickly changing coastal weather.
• Acadia National Park is in Maine, on Mount Desert Island, with Bar Harbor listed as its mailing address by the National Park Service.

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Frequently asked questions about Acadia National Park

When is Cadillac Summit Road closed at Acadia National Park?

The road is closed from 9 to 25 November 2026 and from 1 to 18 December 2026 for construction.

What remains open during the Cadillac Summit Road closure?

Hiking trails on Cadillac Mountain remain open, although the summit road itself is closed to all users during the two periods.

Where is Acadia National Park and how do you get there?

The park is on Mount Desert Island in Maine, with Bar Harbor as the reference town. Cadillac Summit Road branches from Park Loop Road, but there is no public transport service to the summit.