Diamond Creek

History

Diamond Creek was established in 1968 by Al Brounstein, a former pharmaceutical salesman who bought a rugged, heavily wooded parcel on Diamond Mountain and cleared much of it himself. The property sits at the northern end of the Mayacamas range, above Calistoga, and Brounstein recognized early that the land was not one vineyard but several, each with a different character underfoot. He planted Cabernet Sauvignon across three distinct soil zones and began bottling them separately from the 1972 vintage onward, making Diamond Creek one of the first Napa estates to pursue a systematic single-vineyard program at this level of specificity.

That decision proved influential. At a time when most California Cabernet was blended across sites and marketed by brand rather than block, Brounstein was effectively arguing that geography mattered at a fine-grained scale, a position that was far from obvious in early 1970s Napa. The wines gained an underground following and, after the property was included in early critical assessments of Napa's top estates, a more public one.

Al Brounstein died in 2006. His wife Boots, who had been involved in the winery from the beginning, continued to oversee the estate. Diamond Creek was subsequently acquired by the Pellet family, who also own Pride Mountain Vineyards. The transition preserved the essential structure of the program: three named vineyards, single-vineyard bottlings, and the same mountain-Cabernet identity that defined the estate from the start.

Vineyards

The estate sits on Diamond Mountain, a subappellation of Napa Valley characterized by volcanic and sedimentary soils at elevations that moderate the valley-floor heat. Diamond Creek's three vineyards each occupy a different soil type within a relatively compact property, which is the basis for the separate bottlings.

Volcanic Hill, as the name indicates, sits on volcanic rock and ash soils: light, fast-draining, and low in organic matter. Red Rock Terrace takes its name from iron-rich red clay and rock soils that run warmer and retain more moisture. Gravelly Meadow sits at a lower elevation on the property and is defined by well-drained alluvial gravel. A small fourth plot, Lake Vineyard, surrounds a man-made pond and has historically been bottled only in exceptional years when conditions allow.

The elevation and mountain exposure give all three sites a longer, cooler growing season relative to the valley floor, with more diurnal temperature variation. Specific farming certifications are not publicly documented in detail, though the estate has long operated with relatively low intervention in the vineyard.

Winemaking

Diamond Creek produces varietal Cabernet Sauvignon from each vineyard, with minimal blending across sites. The wines are aged in French oak, with a significant proportion of new barrels, and are typically held for roughly two years before release, though exact protocols have shifted across different production eras and ownership transitions.

The Microclimate bottlings, of which the 2020 Volcanic Hill Microclimate 3 is an example, represent a further subdivision within a single vineyard: specific rows or blocks within Volcanic Hill that are harvested and vinified separately. These are small-production wines and are not made every year. The broader lineup is notable for how legibly the soil differences read across the three main bottlings: Volcanic Hill consistently produces the most structured and mineral-edged of the three, Red Rock Terrace tends toward richness and weight, and Gravelly Meadow often sits between them in terms of texture. The winemaking approach appears calibrated to preserve rather than obscure those distinctions.