Monterey County Wine Grapes Range; $35,000-$75,000 Per Acre. San Luis Obispo and Santa Barbara Counties Range $25,000-$75,000 Per Acre. The westside of Paso Robles set the upper end of vineyard values in the region, with vineyards currently selling for approximately $50,000 to more than $70,000 per net vine acre. Source: 2019 CALASFMRA TRENDS in Agricultural Land Values.