Here’s the good news: bitters do not need to be refrigerated. In fact, most bartenders and cocktail historians will tell you that keeping them at room temperature is the preferred method of storage. The high alcohol content—usually around 35 to 45 percent ABV—acts as a natural preservative, meaning your bitters won’t spoil or go bad like a carton of milk.
Think of them as the hermits of the spice cabinet. They’re robust, shelf-stable, and perfectly happy living in a dark, cool pantry next to your vanilla extract and vinegars. Refrigeration can actually dull their volatile aromatic compounds, making them less punchy in your Old Fashioned than you might want.
The Science of the Squirt (Just a Little)
The reason bitters last so long is that they are essentially a concentrated tincture of botanicals, bark, and roots suspended in high-proof alcohol. This environment is hostile to bacteria and mold, so the fridge is overkill. That said, heat and direct sunlight are their true enemies—so avoid storing them on a sunny windowsill or above the stove.
A fun little fact: the original Angostura formula was developed in 1824 as a medicinal tonic for soldiers, and it was designed to survive long sea voyages in tropical heat. If it survived a Caribbean ship’s hold, it can survive your kitchen counter.
