Edna Valley is an American Viticultural Area (AVA) located in San Luis Obispo (SLO) County, California encompassing the rural town of Edna which is 9 miles (14 km) southeast of the county seat San Luis Obispo and north of the small coastal town Arroyo Grande.

With moderate sunshine, cool maritime fog, and rich oceanic and volcanic soils, the Edna Valley appellation has California's longest growing season.

[1] Viticulture in the San Luis Obispo region historically dates back to the 1800s, but not in Edna Valley.

Instead, the valley, with its optimal climate, fertile soils and long growing season, established itself, in the 19th century, for dairy, butter and cheese operations while agricultural crops including garbanzo beans, oats, barley, wheat and hay were grown.

It is oriented along a northwest-southeast axis well defined by the Santa Lucia Mountains on the northeast side; a low, hilly complex on the southeast; and the San Luis Range on the southwest.

This is because of the mountain barrier which runs along the San Luis Obispo County coastline, shielding the inland areas from the moderating ocean influences.

[1] In Edna Valley, killing frosts are rare which is not the case in other inland areas of the county which are denied the benefits of the ocean influence by the mountain barrier.

After evaluating the petition and comments, ATF determined that due to the topographic and climatic features of Edna Valley, it is distinguishable from the surrounding areas.