Howell Mountain AVA

Howell Mountain takes its name from the Isaac Howell family, early settlers who arrived on the mountain in 1846. Commercial viticulture began in earnest in the 1870s and 1880s, led by French winemakers Jean Adolph Brun and Jean V. Chaix, who planted hundreds of acres of vines and operated one of Napa's most successful wine businesses of the era. In 1889, Brun and Chaix won a bronze medal at the Paris World Competition, putting Howell Mountain on the international wine map. Swiss immigrant Frederick Hess founded La Jota Vineyard Co. in 1898, building a stone winery from volcanic rock quarried on the property. Phylloxera in the 1890s and Prohibition in the 1920s devastated the industry, leaving ghost wineries across the mountain. Revival came slowly from the 1960s onward, culminating in the 1983 AVA designation, driven by the efforts of Bill Smith of La Jota, Randy Dunn, Mike Beatty, Bob Brakesman, and Bob Lamborn.

• Named after the Isaac Howell family, who settled the mountain in 1846
• Brun and Chaix won a bronze medal at the 1889 Paris World Competition, an early validation of Howell Mountain's wine quality
• La Jota Vineyard Co., founded in 1898 by Frederick Hess, is the mountain's oldest winery and used stone quarried on the property
• The 1983 AVA designation was achieved through the combined efforts of Bill Smith, Randy Dunn, Mike Beatty, Bob Brakesman, and Bob Lamborn

Howell Mountain occupies the Vaca Mountain Range on the northeast side of Napa Valley, centered around the town of Angwin and overlooking St. Helena. Its AVA boundaries are defined solely by elevation: everything at or above 1,400 feet qualifies, making it one of the few appellations in the world defined by altitude rather than rivers, creeks, or property lines. The appellation rises to approximately 2,500 feet at its highest planted vineyard, Black Sears Estate. Its position above the fog line is a defining climatic feature: while the valley floor is blanketed in marine fog late into the morning, Howell Mountain sits in sunshine. This results in cooler daytime temperatures and warmer evenings than lower elevations, extending the growing season and producing small, concentrated berries. The mountain also receives nearly twice the rainfall of the valley floor, but its porous volcanic soils drain rapidly, keeping vines relatively dry-stressed.

• AVA boundaries defined solely by the 1,400-foot elevation contour, making it one of the world's few altitude-defined appellations
• Located in the Vaca Mountain Range, northeast of St. Helena, centered around the town of Angwin
• Above-the-fog positioning creates cooler days and warmer nights than the valley floor, leveling out heat spikes and extending ripening
• Rocky, porous volcanic soils drain rapidly despite high annual rainfall, keeping vine vigor low and concentrating flavors

Howell Mountain's soils are its most distinctive terroir feature. Two main types define the appellation: decomposed volcanic ash, known locally as tufa, and iron-rich red clay, sometimes called Aiken loam. Both are extremely shallow, with soil depths typically ranging from 12 to 24 inches, and both drain rapidly. Low fertility forces vines to limit vigor and produce small berries with thick skins, yielding deeply colored, tannic, and concentrated wines. The volcanic origin of these soils also contributes a mineral quality that is considered a hallmark of Howell Mountain wines, distinguishing them from richer, more plush expressions grown on the valley floor's alluvial soils. The plateau-like topography of much of the appellation, unusual among Napa's mountain AVAs, makes farming more viable than on steeper ranges.

• Two main soil types: decomposed volcanic ash (tufa) and iron-rich red clay, both shallow and extremely well-draining
• Soil depths of 12 to 24 inches and very low fertility naturally limit vine vigor and reduce crop yields
• Small, thick-skinned berries produce deeply colored, concentrated, and highly tannic wines with prominent minerality
• Plateau-like topography across much of the AVA makes mechanical farming more feasible than on Napa's other mountain appellations

Cabernet Sauvignon is Howell Mountain's signature variety and the foundation of its reputation, producing wines of deep color, firm tannins, pronounced minerality, and dark fruit character that is distinct from warmer valley-floor expressions. Zinfandel also has a long and celebrated history on the mountain, with some plantings dating to the pre-Prohibition era. Merlot, Cabernet Franc, Petite Verdot, Malbec, and Petite Sirah round out the red variety portfolio, while Chardonnay and Sauvignon Blanc appear in smaller quantities. Howell Mountain reds are known for requiring patience: the Cabernet Sauvignons in particular can take five or more years to open and show their best, with the finest examples capable of aging for several decades.

• Cabernet Sauvignon: deeply colored, structured, mineral-driven, with dark fruit and firm tannins distinct from valley-floor wines
• Zinfandel has deep historical roots on the mountain, with some pre-Prohibition old-vine parcels still in production
• Merlot, Cabernet Franc, Petite Verdot, and Malbec are grown as both blending components and varietal wines
• Wines typically need significant cellaring; the best Howell Mountain Cabernets are built for multi-decade aging

Dunn Vineyards is the appellation's flagship estate, founded when Randy and Lori Dunn purchased 14 acres on Howell Mountain in 1978 and produced their first vintage in 1979. Today the family farms 42 acres of Cabernet Sauvignon, and their Howell Mountain bottling, aged in 100% new French oak for around 30 months, is considered one of Napa Valley's most age-worthy wines. La Jota Vineyard Co., founded in 1898 and owned by Jackson Family Wines since 2005, produces small lots of Cabernet Sauvignon, Merlot, Cabernet Franc, and Chardonnay under winemaker Chris Carpenter. Other respected producers include Lamborn Family Vineyards, CADE Estate Winery (part of the PlumpJack group), Arkenstone, O'Shaughnessy Estate, Robert Craig, Robert Foley Vineyards, and Black Sears Estate, which farms the highest vineyard in the AVA at 2,500 feet.

• Dunn Vineyards: founded 1979 by Randy and Lori Dunn, now farming 42 acres of Cabernet Sauvignon; considered a benchmark for age-worthy Howell Mountain Cabernet
• La Jota Vineyard Co.: founded 1898, owned by Jackson Family Wines since 2005, producing Cabernet Sauvignon, Merlot, Cabernet Franc, and Chardonnay from 28 estate acres
• Black Sears Estate holds the highest vineyard in the AVA at 2,500 feet; Robert Craig Winery is the highest winery at approximately 2,300 feet
• CADE Estate, Arkenstone, O'Shaughnessy, Robert Foley, and Lamborn Family Vineyards are among the consistently well-regarded producers

As a federally recognized AVA, Howell Mountain has uniquely altitude-defined boundaries: the lower boundary is set at the 1,400-foot elevation contour, rather than political or geographic features such as rivers or property lines. This was the elevation at which AVA founders determined the fog crested, making vineyards above it climatically distinct from those below. To use the Howell Mountain designation on a label, at least 85% of the fruit must originate from within the AVA boundaries, consistent with standard TTB rules. The Howell Mountain Vintners and Growers Association (HMVGA) is the regional trade body representing the appellation's growers and producers. It promotes the region, organizes events including the annual Taste of Howell Mountain, and supports community causes.

• AVA boundaries are defined by the 1,400-foot elevation contour, one of the few appellations in the world defined solely by altitude
• Standard 85% fruit sourcing rule applies for AVA designation on the label
• The Howell Mountain Vintners and Growers Association (HMVGA) represents producers and growers and organizes the annual Taste of Howell Mountain event
• Howell Mountain remains the first and only mountainous nested sub-appellation to have been established within the Napa Valley AVA at the time of its designation

Howell Mountain is one of Napa Valley's most deliberately unhurried destinations. The narrow, winding roads and remote plateau setting create an experience that feels genuinely removed from the busier valley floor. Most wineries operate by appointment only, including Dunn Vineyards and La Jota Vineyard Co., which welcome visitors but require advance scheduling. A handful of producers accommodate more informal visits. The HMVGA organizes periodic tasting events, including the annual Taste of Howell Mountain, which brings together producers to showcase the appellation's wines in an accessible public setting. The community-minded ethos of the mountain is reinforced by the HMVGA's mission to support local charitable causes alongside its promotional role.

• Most wineries are open by appointment only; advance planning is essential for any Howell Mountain visit
• Narrow mountain roads and a plateau setting create an authentically rural and scenic experience
• The annual Taste of Howell Mountain is the HMVGA's flagship public event, showcasing producers from across the appellation
• The HMVGA actively supports community causes, including fundraising for the local Howell Mountain Elementary School