One of the most exquisite cabernets in the market is here! With its deep, inky, rich violet purple color, Halo is rich with a velvety chocolate and plumb notes with a healthy dose of tannins to complement. 

Halo is produced within the heart of the Oak Knoll District, which is an AVA in the southern reaches of California's Napa Valley. Its location near San Pablo Bay means it is one of Napa's cooler AVAs, and is known for its remarkably bordelais red wines made from Cabernet Sauvignon, Canernet Franc, Merlot and Malbec.

The AVA covers 8,300 acres (3,360ha) of the valley floor immediately north of Napa township and the Carneros AVA. Oak Knoll District borders Yountville and Stags Leap District to the north, and Mount Veeder covers the Mayacamas mountains above.

Like much of the Napa Valley, the Oak Knoll District was first planted to vine during the gold rush of the 1850s, and expanded during the course of the 19th Century. Unfortunately, disease and Prohibition killed off much of Napa's wine industry in the early 20th Century. It wasn't until the 1960s, when Trefethen began to reclaim land in Oak Knoll as vineyard, that winegrowing returned to the area.

Here, average summer temperatures are several degrees cooler compared to the likes of St Helena and Calistoga, mostly thanks to the cooling fog and breezes from San Pablo Bay 15 miles (25km) to the south. With a warm spring and a cool summer, the growing season here can span more than eight months and run into October, giving grapes ample time to ripen fully and develop complexity, while not losing critical acidity.

The Bordeaux grape varieties Cabernet Sauvignon, Cabernet Franc, Merlot and Malbec hold sway among Oak Knoll District's red wines.