Thursday evening at a central Bordeaux wine bar, menus listed bottles from Italy, Spain, and the Loire. Only a few selections carried the Bordeaux label. Staff said tourists ask for Bordeaux, but locals steer toward lighter reds and natural wines from other regions.

Restaurant owners point to changing tastes. Diners, especially younger ones, are seeking lower-alcohol, less tannic wines. By-the-glass pours this month have leaned toward chilled reds from Beaujolais and orange wines from Slovenia. Some managers cited the recent heat as a factor, with crisp whites and rosés outselling Bordeaux reds, even with local steak frites.

Producers in the region are aware. Several have launched marketing efforts, including pop-up tastings and collaborations with local chefs. Still, a server at a brasserie near the Garonne river said on Wednesday that Bordeaux remains a hard sell to city residents. "They want something different now," she said, noting that even during Friday happy hours, few regulars order the classic claret.

Prices may also play a role. A glass of Bordeaux at a downtown bistro can cost more than a comparable import from the Languedoc or Portugal. Some sommeliers say diners see Bordeaux as formal, best suited for special occasions, not for casual summer evenings on terraces.

As the tourist season builds, restaurants expect demand for Bordeaux to rise among visitors. But for locals, the region's own wines are increasingly rare on the table.