There is one exception: homemade bitters. If you’ve crafted your own blend using fresh fruit, herbs, or lower-proof spirits, the alcohol content might be weaker, making spoilage a real possibility. In that case, refrigeration can extend their life by a few months—but still, expect a shorter shelf life.
Store-bought, mass-produced bitters? Leave them out. They’re tough little soldiers. And please, never put them in the freezer—the alcohol won’t freeze solid, but the extreme cold can cause ingredients to separate or crystallize, ruining the delicate balance of flavors.
A Quick Tip for the Obsessed
If you’re a serious cocktail enthusiast, consider decanting your bitters into smaller, dark glass dropper bottles. This minimizes oxygen exposure every time you open the big bottle, keeping the flavors bright. Label them with a Sharpie and a date—it’s a tiny ritual that makes you feel like a mad scientist of mixology.
