[blue_large]Howell Mountain AVA[/blue_large]
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| Year established | 1992 |
| Climate | Similar to the facing Spring Mountain AVA, however slightly warmer and dryer overall due to strong afternoon sun influence. Fairly cool nights in both ranges and higher elevations help maintain good acidity. |
| Elevation | 600 to 2200 ft (184 to 675m). |
| Rainfall | 40 to 50 inches (125cm) annually. |
| Soils | Predominantly volcanic, shallow and infertile. Drainage is high, fertility low. |
| Total Area | 11,000 acres (45 km2) |
| Size of planted vineyards | 1,500 acres (6 km2) |
| Varietals/characteristics | Cabernet Sauvignon, Merlot, Zinfandel: Powerful, firm, blackberry-currant flavors and often richly tannic, with excellent acidity for aging. Chardonnay, Viognier: Sinewy, firm and not as fruity as those of the valley floor, revealing more citrus and stone fruit flavors. |