Our Estate Vineyards

Diamond Mountain District Napa Valley

High on the northern slope of Diamond Mountain in Calistoga, Theorem's estate vineyard sits at approximately 1,000 feet above sea level — far enough from the valley floor to escape the morning fog, close enough to Napa Valley's heart to carry its full authority.

The 60-acre estate is divided roughly into equal thirds: nearly 20 acres of planted vines, 20 acres of redwood and Douglas fir forest, and 20 pastoral acres housing the winery and four historic buildings of circa-1800s origins. It is a place shaped as much by what surrounds the vines as by the vines themselves.

Our Diamond Mountain Estate Vineyard

Nearly 20 acres are planted across eleven distinct blocks — ten of Cabernet Sauvignon and one of Merlot at just under an acre — each its own study in elevation, aspect, and microclimate. The blocks range from original plantings dating to 1985 through more recent work completed in 2019 and 2020, giving the vineyard layers of vine age that add further complexity to the wines. A deliberate selection of Cabernet Sauvignon clones ensures that each block contributes its own distinct character to the cellar. 

Farmed With Restraint

Our Diamond Mountain vineyard is farmed sustainably — no herbicides, no pesticides, no shortcut between the mountain and the bottle. Vineyard manager Josh Clark has guided the restoration, reconfiguration, and replanting of this site from the beginning, bringing deep knowledge of Diamond Mountain's particular demands and a shared belief that the land, properly tended, needs little else. The volcanic soils — primarily Aiken Loam and Boomer Loam — drain quickly, stress the vines naturally, and concentrate flavors without intervention. The mountain heats fast and cools fast. The fruit follows. 

Map of Theorem Vineyards Diamond Mountain Estate

Heritage Clones

Not only does our vineyard have the rare combination of soil and weather to produce world-class wines, but it is also rare for the intentional choices of the clones of grape we grow here — heritage clones of Cabernet Sauvignon, the only vines deserving of a mountain estate that dates to 1878.

We are the stewards of one of Napa Valley's last remaining blocks of the historic Clone 8 Cabernet Sauvignon — planted in 1985, old-school spacing, low yields, the kind of fruit that takes a long time to ripen and gives everything back when it does. On the same hillside, we tell the story of Clone 30, a heritage clone of Cabernet Sauvignon whose lineage can be traced to Harry See, a pioneer of Stags Leap, whose original Cabernet Sauvignon cuttings were preserved by the Disney family, with the help of UC-Davis. Planted on Diamond Mountain in 2019, Clone 30 found its companions on the hillside

On the east-facing slope, where the morning light breaks over the pine forest and red-tailed hawks ride the thermals above, there are just over two acres of something exceedingly rare: the Jenkins clone of Cabernet Sauvignon. Not a commercial clone. Not something you'll find at a nursery. A heritage cutting descended from Château Lafite Rothschild — brought quietly into California decades before the modern wine industry took shape, passed hand to hand by those who understood what it could become in the right soil. Consulting winemaker Thomas Rivers Brown understood. He chose the Jenkins for this block because of what mountain-grown vines do when they struggle — when volcanic rock forces roots deep, when cool mornings and warm afternoons concentrate everything the vine has into small, thick-skinned berries. The Jenkins doesn't just survive that environment. It reveals itself in it. The wine it gives us is called Hawk's Prey — a pure single-vineyard, single-clone Cabernet.

In the Cellar

The winery at Theorem was built with considerable input from Thomas Rivers Brown — custom-designed for our estate vineyards, with various sized tanks and vessels suited for hands-on, block-by-block production. Winemaker Andy Jones, a longtime protégé of Thomas Rivers Brown, carries that same philosophy forward in every vintage: minimal intervention, maximum honesty. What Diamond Mountain gives, the wine delivers.

  • Soils: Aiken Loam, Boomer Loam          
  • Planted Acres: Nearly 18 acres across 11 blocks          
  • Varieties: Cabernet Sauvignon (10 blocks), Merlot (just under 1 acre)          
  • Vines Planted: 1985 — 2020          
  • Elevation: ~1,000 feet

We are still peeling back the layers, uncovering the truth of this magical place in history. With every vintage, our Diamond Mountain vineyard reveals a little more of itself — and we are listening. 

Explore Wines Discover Moon Mountain

An aerial view of Theorem Vineyards' hillside estate, with intimate shots of a hummingbird among lavender, blooming flowers, and vines, followed by wine being poured and aging in oak barrels.

Beyond the Vines, a Story Unfolds

Join us where time slows, and truth is poured. Experience our Diamond Mountain estate in Calistoga, Napa Valley.

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