Summary of drainage classes by American Viticultural Area from Soil Survey Geographic database, masked to exclude water features, showing a predominance of soils classed as well drained.

Abbreviations: ED (excessively drained), SED (somewhat excessively drained), WD (well drained), MWD (moderately well drained), SPD (somewhat poorly drained), PD (poorly drained), VPD (very poorly drained).