Lake County's ideal climate and altitude support sustainable winegrape production, giving growers here a leg up. Not only is winegrape quality excellent, few pests can tolerate the climate. Winegrapes are grown from lake level (1370 feet) up to about 2600 feet. This elevation provides cooler winter conditions and later growing season start than in other California grape-growing regions. Summer growing conditions are suitably warm ripen the varieties Lake County is famous for, Cabernet Sauvignon and Sauvignon Blanc. Proud of their environment, most growers will mention that Lake County has the cleanest air in the state and that the elevation allows rapid cooling in the evening.