Many commercial wineries produce a dual product: commercial wine and wine tourism. Since Idaho wineries charge no entry price, wine tourism demand can only be ascertained with a shadow price for winery visitation. Demand for wine tourism visits for Canyon County in southern Idaho was estimated using the travel cost method. Trip demand was inelastic (-0.4 to -0.6) with respect to own price. The average value of Canyon County wine tourism ranged from $6 to $12 per person per trip, depending upon the assumed opportunity cost of travel time. Elasticities of tastes and preferences, closely related goods, and income were estimated with a view to understanding the market for Idaho's emerging wine tourism industry.