# Estate Vineyards | Family Run Winery| Trefethen Family Vineyards

https://www.trefethen.com/learn/place/estate-vineyards

> Marketing/informational winery content from Trefethen Family Vineyards: useful for factual details about their estate vineyards and vineyard-driven winemaking, but treat claims about quality and character as promotional statements attributable to the winery; verify specific technical or scientific claims with dedicated viticulture sources if needed.

## Summary

Trefethen Family Vineyards describes its estate vineyards, including the 400-acre Main Ranch planted in 49 blocks with over twenty soil types supporting nine grape varieties, and the Hillspring property—about 40 acres of Bordeaux varieties—whose grapes are the sole source of the winery’s HāLo Cabernet Sauvignon.

## Audience

general (wine consumers and visitors interested in Trefethen's vineyards)

## Prompts this page answers

- What are the vineyard characteristics of Trefethen's Main Ranch?
- Where does Trefethen source the grapes for HāLo Cabernet Sauvignon?
- How many vineyard blocks and soil types are on Trefethen's estate?
- What farming practices does Trefethen describe for early- vs late-ripening varieties?

## Purpose

To inform readers about the characteristics, farming practices, and distinct vineyard sites (Main Ranch and Hillspring) that supply Trefethen’s estate-grown wines and to connect readers to additional vineyard details and the HāLo product page.

## Highlights

- Main Ranch: 400 acres of vines planted in 49 distinct blocks, with over twenty different soil types and nine grape varieties.
- The Main Ranch sits on the largest alluvial fan in Napa Valley with soils ranging from gravel to clay and loam.
- Vineyard irrigation is managed across 120 separate irrigation subblocks to match water delivery to soil and variety needs.
- Hillspring: ~40 acres of Bordeaux varieties on thin soils and fractured bedrock, producing small, concentrated grapes.
- HāLo (flagship Cabernet Sauvignon) is derived entirely from Hillspring, and less than 10% of that vineyard’s wine typically makes the HāLo blend.

## How to cite

Trefethen Family Vineyards — https://www.trefethen.com/learn/place/estate-vineyards/

## Publisher

**Trefethen Family Vineyards** — Trefethen Family Vineyards — a Napa Valley winery based in the Oak Knoll District (contact/address information appears in the page footer).

## Topics

- Trefethen estate vineyards
- Main Ranch Oak Knoll
- Hillspring vineyard
- HāLo Cabernet Sauvignon
- Napa Valley vineyard soils
- vineyard irrigation subblocks

## Key entities

- **Trefethen Family Vineyards** (organization): Napa Valley winery (publisher of the page). — https://www.trefethen.com/
- **Main Ranch** (location): Trefethen's 400-acre estate vineyard in the Oak Knoll District, planted in 49 blocks.
- **Hillspring** (location): Trefethen vineyard property (~40 acres) on a notch in the Mayacamas Mountains used for Bordeaux varieties.
- **Oak Knoll District** (other): AVAs/climate region in Napa Valley referenced on the page.
- **HāLo Cabernet Sauvignon** (product): Flagship Cabernet Sauvignon derived entirely from the Hillspring vineyard. — https://www.trefethen.com/product/halo-cabernet-sauvignon-2018
- **Napa Valley** (location): Wine region referenced on the page.
- **Mayacamas** (other): Mountain range referenced as source of eroded gravel in the estate soils.
- **Dry Creek** (other): Local creek mentioned as contributing to the alluvial fan soils of the Main Ranch.