Updated May 2026.
There is no official triple-sec expiry we will invent. Triple sec is flavor English under Cointreau official FAQ: unopened, dark, ambient — the bottle might be kept for years; no expiration date thanks to 40% alcohol. Official open-bottle months unused. Other brand pages unused as a ranking. Heat and air oxidize peel. A 1.5-ounce pour at 40% is one drink.
Related: how long Kahlúa lasts, triple sec for margaritas, peach schnapps vs triple sec.
Closed vs open
| Language | 1.5 oz drinks |
|---|---|
| Cointreau unopened | 1.00 |
| Open months | — |
| Other brands | Neck |
| Triple sec | Read the neck |
Pour math: liqueur drinks.
More in our Liqueurs Guide.
Sources
- cointreau.com L’Unique FAQ: unopened dark ambient — years; no expiry thanks to 40%.
- Open-bottle months unused. 27 CFR 5.150. NIAAA December 2025.