Fridge or cupboard? How long an opened bar bottle keeps, with a shelf-life checker
Gin can sit on the shelf for years, but an opened bottle of vermouth goes flat in weeks. The label rarely says which is which, so most home bars either keep everything for ever or bin things that were fine.
This piece explains the three things that decide how long a bottle keeps (air, strength, and sugar and water) and gives a rule of thumb for each kind: spirits, bitters, liqueurs, cream liqueurs, vermouth, sherry, port and syrups. A checker lets you pick a bottle, say where it lives and drag how long it has been open.
Most of the bottles on a home bar are tougher than you think, and a few are far more fragile. A bottle of gin is happy on the shelf for years. An opened bottle of vermouth left beside it for the same time turns flat and stale. The label rarely tells you which is which, so most of us either keep everything for ever or throw out things that were fine.
The checker below gives you a rule of thumb for each kind of bottle. Pick one, say where it lives and drag the slider to how long it has been open.
What actually spoils a bottle
Three things decide it. Air is the first: wine-based drinks such as vermouth, sherry and port go stale as they oxidise, and the emptier the bottle, the more air is in it. Strength is the second: at spirit strength nothing grows, so gin or whisky never goes off, it only fades slowly. Lower-strength liqueurs have less protection, and published advice for them is shorter. Water and sugar is the third: a syrup or a fresh juice is a friendly place for mould and yeast, which is why those two live in the fridge and are made in small batches.
The short list
| Bottle | Keep it | Rule of thumb once open |
|---|---|---|
| Gin, vodka, rum, whisky, brandy | Cupboard, out of sun | Years. A half-empty bottle may dull after two or three. |
| Bitters | Cupboard | Effectively indefinite. |
| Strong aperitifs and bitter liqueurs | Cupboard | About two years at most. |
| Lower-strength liqueurs (under about 20%) | Cupboard or fridge | About six months at its best. |
| Cream liqueurs | Cool, away from heat | Drink within about a year. The maker of Baileys gives 24 months from bottling. |
| Vermouth and other aromatised wines | Fridge | A month for best; sources say up to four or five months. |
| Dry sherry (fino, manzanilla) | Fridge | Days, two or three weeks at the outside. |
| Sweet sherry and port | Fridge | About five or six weeks. |
| Simple syrup 1:1 | Fridge | About a month. |
| Rich syrup 2:1 | Fridge | Several months; one informal test reached about six. |
| Fresh citrus juice | Fridge | Squeeze it the day you use it. |
The one that surprises people: vermouth
Vermouth is wine with herbs and a little added spirit, so it behaves like wine, not like gin. Once it is open it belongs in the fridge. Advice on how long it lasts runs from about a month to four or five months, so treat the checker's "good" band as the safe one and taste before you trust an older bottle. A flat, dull vermouth makes a flat, dull Manhattan or Martini. If a recipe asks for a dash, buy the small bottle.
Keeping the alcohol-free shelf fresh
If your bar is mostly mocktails, the things that go off are the syrups and juices. Make syrup in small batches, keep it cold, and pour it away if it turns cloudy or smells off. Some people add a spoonful of vodka to a syrup to stretch its life, which only suits you if a trace of alcohol is fine.
Small habits that help
Write the date you opened a bottle on a strip of masking tape. Keep bottles away from the stove, the window and the top of the fridge, where it is warm. Cream liqueurs dislike heat, so a cool cupboard or the fridge is better than the shelf by the radiator. If a cream liqueur smells sour or has curdled, pour it away. Past its best usually just means tired flavour, not danger, except for dairy and fresh juice, where smell and common sense decide.
And a note on the clock: a bottle nearing the end of its window is a reason to make a drink for friends, or to cook with it, never a reason to drink faster.
Why a half-empty bottle ages faster
Each time you pour, a little air goes in, and a bottle that is nearly empty is mostly air. For spirits that is a slow effect measured in years. For vermouth, sherry and port it is quick, which is why the fridge helps and why small bottles make sense for things you use a dash at a time. If you do not use a bottle often, there is little point stocking a large one just because it is cheaper per millilitre.