Viticulture in Ontario, Canada is dynamically related to its terroir - the physical features of the diverse landscapes and climate - influence the choice of viticultural practices across Ontario and create unique conditions for the production of grapes and wine.

Ontario has three primary 'Viticultural Areas' or appellations of origin: Niagara Peninsula, Lake Erie North Shore, and Prince Edward County. Within the Niagara Peninsula appellation, decades of grape growing experience and geographical research has identified ten distinct areas. These sub-appellations include areas on the plains close to Lake Ontario and the benchlands of the Niagara Escarpment.

Ontario wine is made from 100% Ontario grapes that qualify for classification under Ontario's appellation system, the Vintners Quality Alliance (VQA), depending on the varietal, the winemaking techniques employed and other restrictions. Ontario is fortunate to be able to grow many recognized wine grapes, with plantings of Riesling, Chardonnay, Merlot, Cabernet Franc and Pinot Noir. The local conditions support great strength in varieties that are traditionally grown in moderate climates and set the stage for balanced, complex and elegant wines.

The majority of all wines produced in Ontario are dry table wines, made from over 40 grape varieties. As a cool climate region, the wines present a fruit character that is expressive of the particular grape variety but also show an elegance in structure that comes from balanced acidity and minerality that shows through.

Wine production is approx 60% white wine varieties and 40% red. Other white grape varieties of note are Sauvignon Blanc, Pinot Gris, Gewurztraminer and Vidal Blanc while reds include Cabernet Sauvignon, Gamay Noir, Syrah and Baco Noir. Baco Noir and Vidal Blanc are unique varieties, developed in North America and two of only eight hybrid varieties allowed within the Ontario appellation system. Both have proven to produce fine wines, and in the case of Vidal Blanc, exceptional Ice-wine.