Diamond Creek Vineyards

Diamond Creek Vineyards is a pioneering wine producer located in the Diamond Mountain sub-appellation of Napa Valley. Founded in 1968, it was the first winery in California to exclusively produce wines made from Cabernet Sauvignon. It produces terroir-focused wines from different sites in Diamond Mountain.

The winery was founded by Al and "Boots" Brounstein. Al, the former owner of a successful pharmaceutical business in Los Angeles, got into wine when taking a class at UCLA on French wine appreciation. After working a few harvests at Ridge Vineyards, he decided that he wanted to have his own property. He visited a then unplanted property on Diamond Mountain. After consulting with the famed Andre Tchelistcheff and Louis Martini, he purchased it and planted it all to Cabernet Sauvignon.

Diamond Creek Vineyards lies at about 800ft (245m) of elevation. Warm valley air rises along Diamond Creek from the northeast. These are balanced by cool ocean breezes from the west. There are three distinct soil types in its three main vineyards. These are largely separated by small lakes, Diamond Creek itself, and tree blocks. However all have a section which looks onto a pond in the center of the property.

Red Rock Terrace (7 acres/2.8 hectares) sits on a steep hillside with iron-rich soils, facing northwest and overlooked by the winery. It is in a warmer part of the property and produces Cabernet Sauvignon that is more approachable in its youth than other Diamond Creek offerings.

Gravelly Meadow (5 acres/2ha) is located on an old riverbed, and has shallow, alluvial soils with exceptional drainage. Low-yielding vines produce concentrated, tannic fruit.

Volcanic Hill is the largest site at 8 acres (3.2ha), named for its grey-volcanic soils and its hilltop location. It is considered to produce the most ageworthy Cabernet Sauvignon.

In certain years, Diamond Creek also produces a Lake Vineyard Cabernet from the three-quarter-acre (0.3ha) plot of that name to the west of Gravelly Meadow across another small lake. However, this is the property's coolest macrooclimate, and in most years the fruit does not get ripe enough to meet the strict standards here.

After Al passed away in 2006, Boots ran the winery with her son Phil Ross until her death in 2019. The following year the business was acquired by the Rouzaud family of Maison Louis Roederer, who had known the Brounstein family since the 1990s.