Here's the short answer: in 1976, a blind tasting in Paris put California's Stag's Leap Wine Cellars 1973 Cabernet Sauvignon above Bordeaux's most prestigious châteaux, and when the same red wines were re-tasted thirty years later in 2006, a California wine—Ridge Vineyards' Monte Bello—won again. That second result matters more than the first, because it answered the one criticism the French judges could still cling to: that California wines wouldn't age. They did. Let me pour you the whole story.

The Blind Tasting That Shook the Wine World

Picture Paris in 1976, the American Bicentennial year. Steven Spurrier, a British wine merchant and founder of the Académie du Vin, and Patricia Gallagher, the Académie's director, arranged a blind tasting pitting French wines against California's upstarts. Nine French wine experts—educators, winemakers, writers, and sommeliers—did the judging, tasting California Cabernets beside Bordeaux's most prestigious châteaux, and California Chardonnay beside Premier and Grand Cru White Burgundies.

Stag's Leap Wine Cellars, whose own estate account describes the event as having "a revolutionary effect, like a vinous shot heard around the world," notes that the results shocked the wine world. The upstart S.L.V. Estate Cabernet outscored Château Mouton-Rothschild and Château Haut-Brion; among whites, the 1973 Chateau Montelena Chardonnay took top honors. Napa Valley's fate, as the winery puts it, was established that afternoon.

The Original Upset: 1976 Red Wine Results

So which reds actually competed, and how did they finish? Ten wines: six from California, four from Bordeaux. The scores tell the story of a photo finish at the top—Stag's Leap 1973 edged out Château Mouton-Rothschild 1970 by a whisker, 14.14 to 14.09, with Château Montrose 1970 and Château Haut-Brion 1970 close behind. Ridge's Monte Bello 1971 sat fifth, and the rest of the field trailed.

What's striking is how narrow the margins were. This wasn't a rout; it was a coin-flip victory by a three-year-old Napa Cabernet over first-growth Bordeaux in front of French judges who didn't know what they were drinking. Small wonder the result stung. And the French response, as Ridge Vineyards recounts it, was immediate and pointed: the California wines would not age, and the French wines would win if tasted again in thirty years.

That challenge—thirty years, same wines, same question—hung over the event for three decades. It's the reason we're still talking about it.