Four Seasons is planning a new luxury resort in Napa Valley, California, that will include a spa using the natural geothermal waters unique to the Calistoga region.

Owned by Boston-based real estate private equity firm Alcion Ventures and developed in partnership with Aspen, Colorado-based boutique firm Bald Mountain Development, the Napa Valley resort will include 85 guest rooms and 20 private residence villas.

“We set out almost a decade ago to find this kind of opportunity in Napa Valley,” said Martin Zieff, managing partner at Alcion Ventures.

The spa at the resort will include treatments such as mineral-rich clay and volcanic ash baths, as well as skin and body care, nail care and massages, and will also feature geothermal pools overlooking the Palisades.

Designed by Colorado-based O’Bryan Partnership Architects, with interior design by California-based Erin Martin Design, the resort will open in early 2018, and will also include its own fully-operational winery and hand-farmed vineyard, for a grape-to-glass experience for guests.

“This is a unique opportunity to combine a privately-owned and operated winery and vineyard with a world-class luxury resort,” said J. Allen Smith, president and CEO, Four Seasons Hotels and Resorts.

Each of the one- and two-storey residence villas will include multiple master suites, an owner’s wine cellar, and indoor and outdoor dining spaces.

The resort will also feature three restaurants, multiple pools, a fitness centre and an event barn.