Theorem Vineyards spans 60 acres of hillside land on the northern slope of Diamond Mountain in Calistoga, 1,100 feet above sea level. Because of our unique location, we're blessed with little fog, abundant direct sunlight, and a porous volcanic soil that heats and cools quickly.

The property is divided roughly into thirds: 20 acres devoted to vines, a 20-acre forest of redwood and Douglas firs, and 20 pastoral acres for the winery, house, and barns.

In addition to our estate vineyards on Diamond Mountain, we are pleased to introduce our Moon Mountain vineyard. The stunning 34-acre property straddles the Napa / Sonoma County line and is located near the highest point of Moon Mountain at 1800 feet elevation. The shallow, volcanic soils and craggy peaks, alternately grazed by sunlight and Pacific Ocean crosswinds, create a flawless microclimate bordered by Mount Veeder on the east side. We are excited to showcase the exceptional quality and uniqueness of this vineyard in upcoming vintages.

Theorem Vineyards is known for its estate grown Cabernets. We believe in producing excellent wines that reflect the site from where they originate.