Updated April 2026.
Unopened rum does not expire like beer or a grocery mixer. Most standard US rum is bottled at 40% ABV. At that strength ordinary microbes do not live in the bottle. TTB does not require an expiration date on distilled spirits. A sealed bottle stored upright, cool, and dark can sit for years and still be rum.
Opened rum oxidizes. Molasses, oak, and ester notes flatten. That is quality, not a USDA leftover. Month clocks on the old page were folklore. Overproof rum (50–75% ABV on some labels) is even less of a spoilage problem. Flavored rum, coconut liqueurs, and cream rum drinks are not the same bottle — sugar and dairy follow different rules.
Sealed vs opened
| Condition | What happens | What to do |
|---|---|---|
| Sealed 40% rum, cool, dark, upright | Stable for years | Leave it |
| Opened, mostly full | Slow oxidation | Cap tightly |
| Opened, mostly empty | Faster fade | Decant smaller if you care |
| Spiced / flavored rum | Still a spirit if it is bottled at spirit strength; sugar can shift flavor sooner | Read the class. Not a cream liqueur unless the label says so |
| Rum cream / dairy SKU | Different chemistry | Refrigerate after opening; follow the date |
What rum is
Rum is a distilled spirit from sugarcane or molasses (TTB class). White, gold, and aged rum in the US are commonly 80 proof. Bacardi Superior and Bacardi Gold sit in that band — see Bacardi Gold vs Superior. Navy or overproof SKUs print a higher number. Read it. Distillation, not the island on the label, is why a sealed bottle does not sour like juice.
Malibu and other coconut rum liqueurs are often lower than 40% and carry sugar. They still do not grow grocery mold overnight, but they are not “indefinite like 80-proof white rum.” Follow the label. Canned rum cocktails follow the can.
Storage
- Upright, tight cap, out of sun.
- Room temperature. The freezer mutes aroma and will not freeze 80-proof solid.
- Hot cars and sunny windows age the flavor the wrong way.
Tired rum still works in cola or a punch. It is a waste in a sipping glass. For drink math see how much rum to get drunk. For the same distilled-spirits logic, does bourbon go bad.
Sources
- TTB: distilled spirits are not required to carry an expiration date; rum is a sugarcane distillate class, typically bottled at 40% ABV in the US — read the label.
- Opened month clocks: not a TTB spec — cut as folklore.
- Cream and flavored liqueurs are not this paragraph.