Opal Spa - Wentworth By The Sea

Opal Spa at Wentworth by the Sea in New Castle, New Hampshire is the luxury spa experience at one of New England’s most historically significant and beautifully restored grand resort hotels — The Wentworth by the Sea. The hotel’s extraordinary neovictorian architecture, private island setting on New Castle’s harbor peninsula, and sweeping Atlantic views create a resort spa context unlike any other in the Seacoast region.

Opal Spa’s treatment menu spans massage therapy, advanced skincare, hydrotherapy, and body treatments delivered in a beautifully appointed spa environment that reflects The Wentworth’s particular brand of gracious, grand-hotel luxury. The spa’s thermal amenities — sauna, steam, and pool — complement the full treatment menu and allow guests to extend each visit into a genuinely immersive wellness experience. Day spa passes are available for non-hotel guests, making Opal Spa one of the most accessible luxury oceanfront wellness experiences in New Hampshire.