Winery Winery Introduction: Spence Vineyard A vineyard that commits to sustainable farming practises, whilst producing award-winning quality wines Spence Vineyards is located in the Howell Mountain AVA in the hills above Angwin. This area is kn... Award-Winning Wines Cabernet Sauvignon California Wine Howell Mountain Ava Spence Vineyards Sustainable Farming Zinfandel Jun 14, 2023