(Decanter) - Californian grape prices are expected to rise significantly this year as demand continues to exceed supply, although talk of a crisis is overstated, say industry insiders. A surge in demand for grapes and wine in Californian's North Coast region has led many wineries to enter long-term contracts with growers, to ensure a stable supply of fruit for the next several years. Grape prices have risen as much as 30% in some vineyards and appellations during the past six months, John Wilkinson, a member of the board of directors for Napa Valley Grapegrowers and owner of Wilkinson Family Vineyards, told Decanter.com.