Homes for Sale in New Castle, NH

New Castle is one of the most historically significant communities in all of New England. Settled in the early 1600s, it is one of the oldest towns in New Hampshire and served as the colonial capital of the province before Concord assumed that role.

Early Settlement: European settlers arrived on the island in the 1620s, drawn by its strategic position at the mouth of the Piscataqua River. The island served as a vital hub for trade, fishing, and maritime commerce between the colonies and England.

Fort Constitution: One of New Castle's most important historic landmarks is Fort Constitution, originally built as Fort William and Mary by the British Crown. In December 1774 — months before the first shots of the Revolutionary War were fired at Lexington and Concord — patriots from Portsmouth and surrounding towns raided the fort and seized British gunpowder and cannons. This bold act is considered one of the first overt acts of rebellion against the Crown in the American colonies.

Colonial Capital: New Castle served as the seat of colonial government for the Province of New Hampshire during the 17th and 18th centuries, giving the small island an outsized role in shaping the history of the state and the nation.

Wentworth by the Sea: Built in 1874, this grand Victorian hotel became one of the most celebrated resort destinations in New England, attracting presidents, dignitaries, and wealthy vacationers from across the country. Its most historic moment came in 1905 when President Theodore Roosevelt chose it as the site of the Treaty of Portsmouth — the peace agreement that ended the Russo-Japanese War, for which Roosevelt received the Nobel Peace Prize. After decades of decline the hotel was meticulously restored and reopened in 2003 as a Marriott property, and remains one of the crown jewels of the NH Seacoast.

Fort Stark: A lesser known but equally fascinating landmark, Fort Stark served as a coastal defense installation during both World War I and World War II, protecting the entrance to Portsmouth Harbor. Today it is a state historic site open to the public.

Community Character: Despite its remarkable history, New Castle remains a remarkably intimate and unpretentious community. With just over 1,000 year-round residents, the town operates much as it always has — neighbors know each other, community events draw wide participation, and the annual Garden Club plant sale and little league games are as much a part of island life as the sweeping ocean views. It is a place where history and everyday living exist side by side in a way that is genuinely rare in modern New England.