 Elevations in this AVA range from above sea level in the south to above sea level at the northern boundary.Grapes planted in the south-facing slopes of the Horse Heaven Hills benefit from strong winds that arrive from the west via the Columbia Gorge, reducing the likelihood of rot and fungal diseases.Horse Heaven Hills AVA is home to the single largest wine making facility in Washington, the Columbia Crest Winery owned by Chateau Ste.