You found a few cans of root beer pushed to the back of the pantry, well past the date stamped on the bottom, and you’re wondering if it’s safe to crack one open. Unlike milk or meat, soda doesn’t carry the same spoilage risk, so the question isn’t really about safety. It’s about whether it still tastes like root beer.
Does root beer go bad?
The short answer: Not in the way perishable food does. Root beer is a sealed, carbonated, acidic beverage, and that combination makes it inhospitable to the bacteria that cause foodborne illness. What actually happens over time is that it goes flat and the flavor fades, especially once the can or bottle has been opened. The date on the package is a quality estimate, not a safety cutoff, per USDA’s general guidance on food dating.
For a complete pantry storage reference, see our Food Storage Guide.
Does Root Beer Go Bad: At a Glance
Unopened, pantry
Safe past the printed date; expect less fizz and duller flavor over time
Opened, refrigerated
Best within a day or two for carbonation; safe longer, just flatter
Bulging, rusted, or leaking can
Discard without opening, regardless of the date
Caffeine
Most brands are caffeine-free; Barq’s has 22mg per 12 fl oz
Key Takeaways
Root beer doesn’t spoil the way perishable foods do. Carbonation and acidity make it an unfriendly environment for the bacteria that cause foodborne illness.
What actually changes with age is quality: the carbonation dissipates and the flavor fades, especially in a can or bottle that’s already been opened.
An unopened can or bottle typically holds its best quality for months past the printed date; that date reflects flavor and fizz, not a safety deadline.
Most root beer is naturally caffeine-free. Barq’s is a notable exception, with 22mg of caffeine per 12 fl oz can, per Barq’s own website.
Root beer’s flavor traces back to sassafras root, but the safrole compound that federal regulation puts at about 80% of sassafras oil has been banned from U.S. food since 1960, so modern root beer uses safrole-free flavoring instead.
Why Root Beer Doesn’t “Spoil” Like Food Does
Root beer is built on the same basic preservation logic as most sealed soft drinks: carbonation, acidity, and sugar content together create conditions that bacteria and mold struggle to grow in. As long as the can or bottle stays sealed, there’s no real pathway for contamination to get in. That’s why soda is shelved at room temperature right alongside other shelf-stable pantry goods rather than in a refrigerated case.
What you’re actually watching for with an old can of root beer isn’t bacterial spoilage, it’s a slow decline in quality. Carbon dioxide gradually escapes through the can or bottle seal over months and years, even when it’s never been opened, so a soda that’s been sitting for a long time pours flatter than a fresh one. The sugars and flavoring compounds also shift subtly over very long storage, which is why an o
