Champagne has an alcohol ceiling. Heat this year is testing it.
Terre de Vins reports the 2026 harvest as exceptionally early and unusually sugary. Official CIVC bans run from 8 to 22 August by commune and grape. Montgueux in the Aube even picked from 6 August on a derogation. Spring frost destroyed about 40% of buds across the appellation. First yield figures sit near 6,500 kg/ha around Épernay and about 5,500 kg/ha on the Côte des Bars.
The new problem is potential alcohol. Sébastien Goulard of the Institut Œnologique de Champagne has seen lots up to 14%. Some Sézannais samples reach 15. The cahier des charges caps Champagne at 13% vol after prise de mousse. Alcoholic fermentation plus the second fermentation in bottle can add up to about 1.2 degrees. Start too high and the finished wine can miss the legal name.
Julien Chopin, president of the Monthelon-Morangis co-op, says almost all varieties opened at once. They pressed Chardonnay first — usually they start with Meunier — because analyses showed 11.25–12.65 potential. Taille acids sit around 4.5 g/l, with pH 3.10–3.15.
Mini-concept: the second fermentation is not free. It adds alcohol. A grape that already reads 14% can overshoot the 13% cap once the bubbles are made.
A flavoured can has no appellation rule. A Champagne bottle must finish under that 13% line.
Hold the pattern: Champagne’s legal name is capped at 13% after the mousse.