Estate Vineyards
We knew early on that we wanted to own our own estate vineyards. Having control over each step of the growing process — and deeply understanding the land by farming it year after year — is crucial to cultivating the highest quality grapes and making the best mountain-grown wines.
Our estate vineyards in Diamond Mountain District and Moon Mountain District AVAs are integral to our mission at Theorem Vineyards: to uncover the truth of the land. We craft single-vineyard, single-varietal wines exclusively from these two mountain estates — not because it is the easiest path, but because it is the most honest one. Each wine is an unfiltered expression of a specific place: its elevation, its volcanic soils, its microclimate, and the season that shaped it.
We farm with restraint. No herbicides, no pesticides. No shortcut between the mountain and the bottle. Native cover crops build soil health, control erosion, and draw beneficial insects. Shade cloth manages heat events without chemical intervention. Managed and native beehives work the bloom. Redwood and Douglas fir forests ring the estate, sheltering the birds that keep the vineyard in balance. We protect it. It sustains us. That exchange is the foundation of everything we grow.
Josh Clark, one of Napa Valley’s most respected vineyard managers, has guided the restoration, reconfiguration, and replanting of these estate sites alongside us. In the cellar, winemaker Andy Jones — a longtime collaborator of Thomas Rivers Brown — brings the same philosophy of restraint and precision to every vintage. What the mountain gives, the wine carries through.
Diamond Mountain District, Napa Valley
Our Napa Valley vineyard on Diamond Mountain in Calistoga spans 18 planted acres of hillside land on the northern slope of the mountain — eleven distinct blocks planted almost entirely to Cabernet Sauvignon, including two heritage clones, with just under an acre of Merlot. The estate vineyard shares the land with acres of redwood and Douglas fir forest, and the undulating hills result in numerous elevations, aspects, and microclimates across the property. Because of its high altitude, the vineyard is blessed with little fog, abundant direct sunlight, and volcanic soils that heat and cool quickly — concentrating flavor with every season.
Moon Mountain District, Sonoma County
Our property on Moon Mountain District straddles the Napa/Sonoma county line bordering Mt. Veeder at 1,500-1,800 feet elevation — near the highest point of the mountain, where the vines exist at the edge of what the land will give. Fourteen acres of old, heritage, and young vines are planted across a diverse range of varieties, with Chardonnay, Sauvignon Blanc, Syrah, Grenache, and Cabernet Sauvignon among them — each block shaped by shallow volcanic soils, craggy terrain, and Pacific crosswinds that sweep across the mountain and create multiple microclimates unlike anything in the valley below.