Saint Croix Island, Maine

Island Historic island marking French-English colonial boundary

A small island in the St. Croix River at the US-Canada border, Saint Croix Island is an International Historic Site commemorating early French settlement; visitors come for history and shoreline wildlife.

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Main image

Saint Croix Island is a small island in the Saint Croix River at the border between Maine, United States, and New Brunswick, Canada, notable as the site of a French settlement established in 1604. The settlement, associated with Pierre Dugua de Mons and Samuel de Champlain, was short-lived but historically significant.

The island is now protected as a historic site and is interpreted for visitors via displays and viewing areas on the U.S. shore near Calais, Maine; the island itself is not generally open for landing to protect archaeological remains. Interpretive materials and a monument mark the site’s history and its role in early European colonization of northeastern North America.

Geographically the island sits in the tidal Saint Croix River close to the towns of Calais, Maine, and St. Stephen, New Brunswick, and is visible from parks and viewpoints on the riverbank.

  • Early French settlement: The island marks one of the earliest French attempts at North American colonization in 1604 and is commemorated by interpretive markers and a monument.
  • Access restriction: Landing on the island is restricted for preservation reasons, so the usual visitor experience is viewing from the shore or by authorized boat tour.

What to See #

  • Historic island site: A small island in the Saint Croix River that was the site of a French colonial settlement led by Pierre Dugua de Mons and Samuel de Champlain in 1604.
  • Viewing point: A shoreline viewing area and interpretive displays on the U.S. side allow visitors to learn about the 1604 colony and view the island from Calais, Maine and nearby parks.
Saint Croix Island, Maine
Saint Croix River (off Robbinston, Maine), USA
45.1284, -67.1333

How to Get to Saint Croix Island, Maine #

Access is by private boat from the U.S. side (Robbinston, Maine) or from Canadian launch points on the New Brunswick shore; there are also occasional guided boat trips. Always check local access rules as the island lies close to the international boundary.

Tips for Visiting Saint Croix Island, Maine #

  • Saint Croix Island is an uninhabited island and the Canada-US boundary marker; check local regulations before visiting by private boat.
  • Bring binoculars: the island offers good seabird viewing during breeding season.

Best Time to Visit Saint Croix Island, Maine #

Summer offers the easiest access by water; check tides and local weather.

Summer
June-August · 15-25°C (59-77°F)
Best for boating and wildlife observation; waters are calmer and warmer.
Late spring
May · 8-15°C (46-59°F)
Migration and nesting periods begin; fewer boat traffic days.

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