Calendal produces wine from Plan de Dieu, a distinguished sector within Côtes-du-Rhône-Villages in the southern Rhône Valley. The region's warm continental climate and limestone-rich soils favor the dark-skinned varieties that define its character. The winery's Plan de Dieu blends Grenache and Mourvèdre—grapes that thrive in this terroir and yield wines with the structure and depth the appellation is known for. Wine Spectator and Wine Advocate have rated Calendal's releases, reflecting the quality standards of serious Rhône production.