Côtes de Ciel produces wines from Red Mountain, the warmest and most prestigious subregion of Washington's Yakima Valley. The vineyard's south-facing slopes and volcanic soils create ideal conditions for Bordeaux and Rhône varieties. The winery's portfolio centers on Petit Verdot, Merlot, and Syrah—grapes that thrive in Red Mountain's intense growing season. The Ciel du Cheval Vineyard Petit Verdot, rated 93 by prestige critics, demonstrates the structure and depth the site achieves with this traditionally supporting variety. The Merlot and Reserve Syrah follow at 92 and 91 respectively, each reflecting Red Mountain's capacity for ripe, concentrated fruit balanced by the region's natural acidity. Wine Advocate, Wine Enthusiast, Falstaff, and Wine Spectator have all assessed the winery's output. Red Mountain's reputation rests on its ability to produce wines of power and refinement—a balance Côtes de Ciel pursues across its core releases.