Winery Directory

Oak Ridge Winery is a Lodi-based winery founded when the Maggio family acquired a facility originally built in 1934. The multigenerational Maggio family operates approximately 2,200 acres of vineyards in the Lodi AVA and produces wines under multiple brands including OZV (Old Zinfandel Vines), Old Soul, Maggio Estates, and 1906 Vintners, focusing on quality and heritage grape growing.

Oakville Grocery is a food and wine destination located in Oakville, California, featuring a grocery store with local provisions, a wood-fired pizza oven, and the adjacent Oakville Wine Merchant tasting room. The business offers over 200 wines from Napa and Sonoma counties, with over 85 wines available by the glass, and serves artisan sandwiches and seasonal California cuisine using local ingredients.

O'Brien Estate Winery is located on 33 acres in Napa Valley and offers private wine tastings focused on estate wines. The winery's wines have received multiple Robert Parker Jr. reviews scoring between 94 and 98 points, and have won numerous Best of Class and Double Gold Medal awards in wine competitions.

Obsidian Ridge Wine Co. is a Sonoma-based winery farming on volcanic land in the Mayacamas Mountains at 2,875 feet elevation. The company produces wines from two vineyards: Obsidian Ridge Vineyard, planted 20 years ago on volcanic terrain, and Poseidon Vineyard in Napa Carneros, planted in 1973. Known for cabernet sauvignon, pinot noir, and chardonnay, the winery uses Hungarian oak barrels from their own cooperage and practices sustainable farming.

O'Neill Vintners & Distillers is a wine and spirits producer founded in 2004 with operations in Parlier, California. The company operates vertically integrated vineyards, wineries, and distilleries, producing both national wine brands and custom exclusive brands for retailers and restaurants, along with brandy, spirits, and bottling services.

Opus One is a winery located in Oakville, California, founded as a collaboration between two families to produce a singular wine that expresses the character of each vintage and the terroir of its vineyards. The estate offers multiple tasting experiences that celebrate its French and American heritage.

Orin Swift Cellars and Winery is located in St. Helena, California, where it opened in 2013. The winery, founded by Dave Phinney, produces a range of wines including red and white varietals, with notable releases such as The Prisoner, Papillon, Abstract, and Machete. The tasting room, housed in a historic downtown St. Helena bank building, offers four distinct tasting experiences.

O'Shaughnessy Estate Winery is a family-owned estate winery spanning three Napa Valley appellations: Oakville, Howell Mountain, and Mount Veeder. The 120-acre Howell Mountain property features 42 acres of 30-year-old vines and estate caves. The winery has produced wines since its first harvest in 2003 and operates on organically farmed practices.

OVID Napa Valley is an estate winery located on Pritchard Hill in St Helena that produces small-quantity, estate-grown wines including Syrah. The winery focuses on wines of place and precision, with releases that evolve over time, and offers wines exclusively through direct allocation.