Château Cos d’Estournel, the Saint-Estèphe Second Growth best known for its reds, continues to make a small-production dry white under the Bordeaux Blanc AOC. The 2025 Cos d’Estournel Blanc is a Sauvignon Blanc–Sémillon blend (repeatedly reported at 56% Sauvignon Blanc and 44% Sémillon) that reviewers describe as unusually driven by acidity and mineral detail while still carrying the estate’s signature concentration.

Several critics call this an outstanding success. James Suckling delivers an excellent early assessment at 98–99 points, calling it “an incredible wine with electrifying acidity and great depth and concentration,” adding that a “pH of just over 3 gives a unique combination of tangy acidity and ripe fruit,” and even asking, “Best ever?” Jane Anson (96 points) also highlights the “long ageing potential,” tying the profile to viticulture changes: the vines were “field grafted… back in 2021 onto more limestone-rich soils,” and “the results are clear in the glass.”

The technical details reinforce the style. Vinous’ Neal Martin (92–94) notes the fruit was “picked between August 25 and September 3 and matured in just 6% new oak,” finding it “very well balanced, with a silver thread of acidity… brisk and focused.” Jeb Dunnuck (95–97) likewise cites élevage in “6% new barriques” and calls it “vibrant, focused… with bright acidity and outstanding length.”

Aromatically, the range runs from orchard fruit and florals to saline, stony notes. Martin mentions “Anjou pear and wild peach, vanilla pod and light chamomile,” while Robert Parker’s Wine Advocate (90–92) finds “white fruits, herbs and spice” and a “citrus-inflected, long and fresh finish.” The Drinks Business (95–97) points to low yields “below 20 hl/ha” plus pH 3.00 and 13.17% ABV, describing an “iodine” edge and labeling it “one of the whites of the vintage.” Jeff Leve (95) suggests a 2027–2035 window, emphasizing its “racy, vibrant” finish of “sweet citrus and juicy white peaches.”