• Type: Winery
• Status: Active
• Founded: 1925
• Region / AVA: Santa Clara Valley AVA
• Location: 1480 East Main Ave, Morgan Hill, CA 95037
• Founders: Emilio and Emilia Guglielmo
• Current Owners: Guglielmo Family (3rd and 4th generation)
• Winemaker: George E. Guglielmo (3rd generation)
• Associated vineyards: Estate vineyards (~50 acres in Santa Clara Valley AVA)
• Historical significance: Oldest continuously operated family winery in Santa Clara Valley; Gene Guglielmo petitioned for Santa Clara Valley AVA designation (established 1989); preserved Italian winemaking heritage through Prohibition; 100-year family continuity (1925-2025)

Guglielmo Winery (founded 1925) is the oldest continuously operated family winery in the Santa Clara Valley, established by Italian immigrants Emilio and Emilia Guglielmo in Morgan Hill. The winery has been operated by the Guglielmo family for four generations (100 years as of 2025), surviving Prohibition and preserving Italian winemaking traditions in the valley. Gene Guglielmo (third generation) played a crucial role in establishing the Santa Clara Valley AVA in 1989 by petitioning the Bureau of Alcohol, Tobacco, and Firearms, codifying the region's historic wine identity. With ~50 acres of estate vineyards planted to Italian and Bordeaux varietals, Guglielmo produces 40,000+ cases annually under three flagship brands.

• 1909 — Emilio Guglielmo emigrated from Piemonte region, Italy to America
• 1925 — Emilio and Emilia Guglielmo purchased 15 acres in Morgan Hill; established Emilio Guglielmo Winery (anticipating end of Prohibition)
• 1925-1933 — Operated during Prohibition; produced wines for Italian, French, and Basque communities
• 1933 — Prohibition ended; winery continued legal operations
• 1945 — George W. Guglielmo (second generation) joined family business
• 1980s — Third generation (brothers George E., Gene, and Gary Guglielmo) took over operations
• 1989 — Gene Guglielmo petitioned for and achieved Santa Clara Valley AVA designation (established March 27-28, 1989)
• 2025 — Winery celebrates 100th anniversary; operated by 3rd and 4th generation family members

Emilio Guglielmo left Italy's Piemonte region in 1909 and immigrated to America. Piemonte (Piedmont) is one of Italy's premier wine regions, known for Nebbiolo, Barbera, and traditional winemaking.

In 1925, Emilio and his wife Emilia Guglielmo purchased 15 acres in Morgan Hill and established Emilio Guglielmo Winery.

The timing was strategic—founded anticipating the end of Prohibition. The winery began producing wines for the Italian, French, and Basque communities in the Santa Clara Valley, maintaining cultural winemaking traditions during the dry years.

Like many Italian family wineries, Guglielmo survived Prohibition through:

• Home winemaking for personal and community consumption
• Serving ethnic community markets (Italian, French, Basque)
• Maintaining vineyard infrastructure for post-Repeal revival
• Preserving Italian winemaking knowledge and techniques

This continuity through Prohibition distinguishes Guglielmo as a true "continuously operated" winery—unlike wineries that closed and reopened after Repeal.

After Prohibition ended in 1933, Guglielmo continued legal commercial operations, building on the infrastructure and community relationships established during the dry years.

In 1945, George W. Guglielmo (second generation) joined the family business, beginning the multi-generational succession that continues today.

In the 1980s, third generation brothers took over:

• George E. Guglielmo (winemaker)
• Gene Guglielmo
• Gary Guglielmo

This generation modernized operations while maintaining family traditions and Italian varietal focus.

Gene Guglielmo's most significant contribution was petitioning for the Santa Clara Valley AVA designation.

In 1989, Gene Guglielmo:

• Submitted a petition to the Bureau of Alcohol, Tobacco, and Firearms (ATF) in Washington, D.C.
• Advocated for recognition of Santa Clara Valley as a distinct wine region
• Documented the region's historic wine identity and terroir

On March 27-28, 1989, the Santa Clara Valley AVA was officially established by the ATF after evaluating the petition.

Significance:

• Codified the valley's wine heritage dating to the 1800s
• Provided marketing identity for valley wineries
• Preserved historical recognition of the region
• Enabled appellations on wine labels
• Demonstrated institutional leadership by a family winery

This AVA establishment was crucial for preserving the identity of a wine region increasingly threatened by Silicon Valley urbanization.

The fourth generation of the Guglielmo family has joined operations, ensuring continuity into the winery's second century.

2025 marks the winery's 100th anniversary—a rare milestone achieved by few California wineries.

Estate Vineyards (~50 acres):

• Italian Varietals:
  • Grignolino
  • Sagrantino
  • Sangiovese
  • Barbera (likely, given Piemonte heritage)
• Bordeaux Varietals:
  • Cabernet Sauvignon
  • Merlot
• Other:
  • Zinfandel
  • Petite Sirah
  • Carignane
  • Chardonnay

Purchased Fruit:

• Also sources from other California winegrowing regions

1. Guglielmo Private Reserve

   • Estate-grown fruit
   • Majority of award winners
   • Premium tier

2. Tre

   • Mid-tier brand

3. Emile's

   • Oldest label (named for founder Emilio)
   • Heritage brand

Family Philosophy:

• Produce natural, quality wines
• Share with family and friends
• Preserve Italian winemaking traditions
• Four-generation knowledge transmission

Scale: 40,000+ cases annually

• 2022 Chardonnay — Silver, 2024 SF Chronicle
• 2021 Sangiovese — Bronze, 2024 SF Chronicle
• 2020 Cabernet Sauvignon — Bronze, 2024 SF Chronicle
• Private Reserve Sagrantino — Double Gold, Best in Class
• 2016 Cinque — Gold Medal SF Chronicle

The Sagrantino (Double Gold, Best in Class) is particularly notable—this varietal from Umbria, Italy is rare in California, demonstrating Guglielmo's commitment to Italian varieties.

• Address: 1480 East Main Ave, Morgan Hill, CA 95037
• Phone: (408) 779-2145
• Website: http://www.guglielmowinery.com
• Tasting Hours: Wednesday-Monday, 11am-5pm (Closed major holidays)

Architecture:

• Italian-inspired setting
• Large wooden beams
• Stone walls
• Terracotta tile in tasting room

• Villa Emile — Event venue
• Heritage Room — Event venue
• Available for weddings, corporate events, private events

Villa in the Vineyard:

• Romantic overnight stays available
• Immersive vineyard experience

• Emilio Guglielmo — Founder (1925); emigrated from Piemonte 1909
• Emilia Guglielmo — Co-founder (1925)
• George W. Guglielmo — Second generation (joined 1945)
• George E. Guglielmo — Third generation; winemaker (1980s-present)
• Gene Guglielmo — Third generation; petitioned for Santa Clara Valley AVA (1989)
• Gary Guglielmo — Third generation (1980s-present)
• Fourth generation — Current family members (2000s-present)

Contemporary Italian Family Wineries:

• Fortino Winery — South Valley Italian family winery (1970)
• Solis Winery — Hecker Pass area; Bertero 1917, Solis 1989
• Colombano Winery — Early Morgan Hill Italian winery (1913-1945)
• Pedrizzetti Winery — Acquired Colombano site (1945)
• Kirigin Cellars — Another continuity family winery

Valley Context:

• Almaden Vineyards — Major valley institution
• Mirassou Winery — Pellier-Mirassou dynasty (1854-present)

• Wineries of Santa Clara Valley — Regional wine association
• Santa Clara Valley AVA — Gene Guglielmo instrumental in 1989 establishment

Guglielmo is frequently described as the oldest continuously operated family winery in the Santa Clara Valley.

Key to "continuously operated":

• Founded 1925 (during Prohibition)
• Never closed
• Same family ownership for 100 years (4 generations)
• Continuous winemaking tradition

This distinguishes Guglielmo from wineries that:

• Closed during Prohibition and reopened after
• Changed ownership between generations
• Were absorbed by corporations

Gene Guglielmo's petition for Santa Clara Valley AVA designation was crucial institutional leadership:

Why it mattered:

• Codified regional identity with historic roots to 1800s
• Protected wine heritage amid Silicon Valley urbanization
• Enabled marketing and appellation labeling
• Preserved recognition of valley's viticultural history
• Set precedent for regional wine advocacy

Without this AVA, the Santa Clara Valley's wine identity might have been lost to suburban development and tech industry expansion.

1989 timing was critical:

• Silicon Valley boom accelerating
• Vineyard land under development pressure
• Regional wine identity needed formal recognition

Guglielmo represents the Italian immigrant wine tradition in Santa Clara Valley:

From Piemonte to California:

• Emilio brought Piemontese winemaking knowledge (1909)
• Planted Italian varietals (Grignolino, Sagrantino, Barbera)
• Maintained Old World techniques through four generations
• Served Italian community during and after Prohibition

Italian varietals: Guglielmo's focus on Grignolino and Sagrantino (rare in California) demonstrates commitment to Italian wine culture beyond commercial Sangiovese/Barbera.

Guglielmo's survival through Prohibition (1925-1933) demonstrates:

• Community-based wine culture (Italian, French, Basque)
• Family resilience and adaptability
• Preservation of knowledge during hostile regulatory environment
• Foundation for post-Repeal success

100-year family ownership (1925-2025) is rare in California wine:

The generations:

1. Emilio and Emilia (1925-1945) — Founders, Prohibition survival
2. George W. (1945-1980s) — Post-Prohibition growth
3. George E., Gene, Gary (1980s-present) — Modernization, AVA establishment
4. Fourth generation (2000s-present) — Second century

This continuity preserved:

• Italian winemaking philosophy
• Family recipes and techniques
• Institutional knowledge
• Regional leadership role

Guglielmo anchors the Morgan Hill/Hecker Pass Italian winery tradition:

• Part of cluster of Italian family wineries
• Preserved regional character
• Maintained tourism/tasting room culture
• Demonstrated small winery viability

• Operations: Active winery; 40,000+ cases annually
• Ownership: Guglielmo family (3rd and 4th generation)
• Vineyards: ~50 acres estate vineyards in Santa Clara Valley AVA
• Tasting: Wednesday-Monday, 11am-5pm
• Events: Villa Emile, Heritage Room, Villa in the Vineyard available
• Philosophy: Family-focused, Italian varietal preservation, quality production
• Milestone: 100th anniversary in 2025

• Exact acreage expansion over time (started with 15 acres in 1925, now ~50)
• Complete production volumes by decade
• Details of Prohibition-era operations (legal status, production volumes)
• When fourth generation members joined
• Whether Emilio Guglielmo made wine in Piemonte before emigrating
• Complete varietal list over 100 years (what was planted in 1925 vs. now)
• Details of Gene Guglielmo's AVA petition process (dates, arguments, documents)
• Relationship with other Italian winery families in valley
• How winery adapted to Silicon Valley urbanization pressures
• Future plans for fifth generation

• Gene Guglielmo's AVA petition to ATF (1989) — archival research needed
• Winery business records (family archives)
• Property deeds from 1925

• Guglielmo family oral history (potential)
• Interviews with George E., Gene, Gary Guglielmo

• Wine industry publications
• Silicon Valley Wine Heritage materials

• Guglielmo Winery
• Santa Clara Valley AVA - Wikipedia
• Discover the Wineries of Santa Clara Valley, Part 1
• Visit Gilroy - Historical Wineries in Gilroy Part 1
• Wineries of Santa Clara Valley - About Us
• Santa Clara Valley AVA History

• Founded 1925 by Emilio and Emilia Guglielmo
• Emilio emigrated from Piemonte, Italy (1909)
• Oldest continuously operated family winery in Santa Clara Valley
• Gene Guglielmo petitioned for Santa Clara Valley AVA
• AVA established 1989 (March 27-28)
• George W. Guglielmo joined 1945 (2nd generation)
• Third generation (George E., Gene, Gary) took over 1980s
• 100th anniversary 2025
• 40,000+ cases annual production
• ~50 acres estate vineyards
• Italian varietals focus (Grignolino, Sagrantino)

• Exact Prohibition-era operations details
• Complete ownership succession timeline
• When fourth generation joined
• Original 1925 varietal plantings

• Whether Emilio made wine in Italy before emigrating
• Complete details of AVA petition process
• Exact production volumes during different eras

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See Also:

• Santa Clara Valley AVA — Region Gene Guglielmo helped establish
• Fortino Winery — Contemporary Italian family winery
• Solis Winery — Hecker Pass Italian heritage
• Colombano Winery — Predecessor Italian winery
• Pedrizzetti Winery — Acquired Colombano site
• Kirigin Cellars — Another continuity winery
• Mirassou Winery — Contemporary valley dynasty
• Almaden Vineyards — Major valley institution
• Italian Immigrant Vintners — Topic page
• Prohibition Era Continuity — Topic page
• Family Wine Dynasties — Topic page