Winery Directory

Oak Flat Vineyards is a family-owned winery located in Portland, Oregon's Belmont neighborhood, featuring a tasting room and bistro. The winery produces Rhône-style wines including Grenache, Syrah, and Mourvèdre blends from grapes grown in a ten-acre vineyard near The Dalles. The tasting room offers wine tastings, a wine club, and bistro fare.

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.

Ojai Mountain is an organic estate winery in Upper Ojai, California, located at 2,800 feet elevation on California's highest coastal vineyard. The winery produces Rhône varietals including Syrah, Mourvèdre, Grenache, Roussanne, and estate blends entirely from its own grapes, focusing on wines with natural acidity and mineral character shaped by the mountain's cool nights, Pacific winds, and shale soils. The estate was planted in 2018 and practices organic and regenerative farming.

Olabisi Winery is a limited production winery founded in 2002 by a winemaker and his wife Kim, producing under 1,000 cases annually of handcrafted wines from carefully selected vineyard sources. The winery focuses on individual expressions of specific vineyards, with the founder bringing experience from positions at Storybook Mountain in Napa Valley and various wineries in Napa, Australia, South Africa, and Bordeaux.

Oliver Winery is located in Bloomington, Indiana and produces a range of wine styles including semi-sweet, semi-dry, dry whites, dry reds, dessert, and sparkling wines, along with ciders and meads. Founded in the 1960s as a hobby, the winery has grown into one of the largest in the U.S. and is distributed in 40+ states. The winery is known for fruit-forward, approachable wines and operates as a destination tasting room.

Onehope is a Napa winery that produces red, white, rosé, and sparkling wines across California and other regions including Napa Valley, Sonoma, and Central Coast. The winery operates a direct-to-consumer business model with a wine club, tasting experiences, and wine rep program. Each bottle sold donates $25 in school supplies, and tastings can direct 10% of proceeds to causes of the host's choice.

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.

Ram's Gate Winery is located in Sonoma, California, perched on a hill overlooking an organically farmed 28-acre estate vineyard. Positioned between three AVAs—Sonoma Valley, Sonoma Coast, and Carneros—the winery is known for its Pinot Noir and Chardonnay, along with other varietals from Northern California terroirs. Under Director of Winemaking Joe Nielsen, the estate focuses on thoughtful precision farming, sustainability, and refined hospitality experiences.

Opici Family Distributing is a wine and spirits distributor operating in New York since 1945, serving the entire state market with over 300 vendors and 5,000 selections for restaurant and retail partners. The company partners with RNDC in New York as of 2022 and is part of a fourth-generation, family-owned wholesaler with roots in the wine business dating back to 1913.

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.

Outpost is a vineyard situated on Howell Mountain in Napa Valley, positioned above the valley fog. The winery focuses on creating wines with character and a strong sense of place from this unique location.

Overshine Wine Co. is a California winery founded by David Drummond and Sam Bilbro, located in Sonoma County. The winery produces organic and regenerative wines from its Las Cimas and Il Campo vineyards, emphasizing joyful, drinkable wines that reflect California's diversity and culture.

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.