How long is soda safe to drink after the expiration date?

Unopened regular soda is generally safe for 6 to 9 months past the 'best-by' date, while diet sodas typically maintain quality for 3 months. Because soda is carbonated and acidic, it is not a hospitable environment for bacteria, making it a matter of taste and carbonation rather than safety.

Does diet soda expire faster than regular soda?

Yes, diet soda expires faster because artificial sweeteners like aspartame break down chemically over time, losing their sweetness and altering the flavor. While still safe to drink, diet soda will taste 'off' much sooner than sugar-sweetened soda, which acts as a better preservative for flavor.

Is it dangerous to drink flat, expired soda?

Drinking flat, expired soda is not dangerous, but it will be unpalatable. As carbon dioxide escapes the container, the soda loses its 'bite' and the flavor profile shifts. Unless the container is damaged, leaking, or showing signs of mold, the primary risk is a poor-tasting beverage.

Can you get food poisoning from old soda?

It is highly unlikely to get food poisoning from old soda if the seal is intact. The high acidity and lack of nutrients in most soft drinks prevent the growth of harmful pathogens. However, you should always inspect the container for bulging, rust, or leaks before drinking.

Does Soda Expire? What Happens If You Drink It Past the Date

Drinking expired soda is generally safe because carbonated soft drinks are not perishable and do not “expire” in terms of food safety. While the dates on Coca-Cola or Pepsi cans are “best-by” markers for peak quality, an unopened soda remains safe to drink indefinitely if the seal is intact. However, over time, the beverage will lose carbonation, the flavor will shift, and artificial sweeteners in diet sodas will begin to break down.

Reading the date of an expired Coca-Cola soda can

Scientific Fact-Check: Does Soda Actually Expire?

The Food Safety Reality: From a public health standpoint, unopened carbonated soft drinks never expire. Because soda is highly acidic and carbonated, it is a completely inhospitable environment for bacterial pathogens. An intact can remains safe to drink indefinitely.
The Chemical Reality: The “best-by” date stamped on the container is an indicator of flavor logistics, not safety. Over time, regular soda degrades via a slow loss of carbonation through plastic or metal pores, while diet sodas degrade rapidly due to the chemical breakdown of artificial sweeteners like aspartame.
The Core Difference: Regular sugar-sweetened soda acts as its own flavor preservative and tastes acceptable for up to 9 months past its date. Diet soda loses its flavor profile within 3 months because its synthetic molecular bonds fail.

How Long Can You Keep an Expired Soda Before Drinking It?

The pervasive confusion surrounding whether soft drinks expire is driven by a fundamental misunderstanding of commercial food logistics. When major bottling networks like Coca-Cola or Pepsi stamp a date on a container, they are enforcing a strict brand-consistency threshold for their distribution networks, not a expiration deadline for the consumer.

The internet copy-paste echo chamber looks at these manufacturer sell-by parameters and translates them into chemical warnings. In reality, the high concentration of dissolved carbon dioxide CO₂ combined with a low pH environment creates an atmospheric seal that stops microbial spoilage in its tracks. The date exists to protect corporate flavor profiles, not your stomach. The “best by” date solely tells you when the soda is expected to be at its peak quality and taste. After this date has passed, the soda company does not guarantee that the soda will be at its best.

While an intact container means your beverage remains safe from a public health perspective indefinitely, the physical ingredients inside the liquid are still subject to the laws of chemical degradation. Over time, CO2 escapes and molecular flavor compounds alter. If you want to consume your soft drinks while they still taste exactly like the manufacturer intended, you should follow these realistic operational timelines past the stamped date:

Clear vs. Dark Sodas (Sprite vs. Coca-Cola): Clear, caffeine-free citrus sodas like Sprite or 7Up are slightly more susceptible to flavor spoiling if exposed to direct sunlight (UV degradation) compared to dark colas like Coke or Pepsi, which contain caramel color that offers a microscopic level of light protection. Always store clear sodas in a dark pantry past their date.
Regular Sugar-Sweetened Sodas (Cans & Glass): Best within 6 to 9 months past the stamped date. High-fructose corn syrup and natural sucrose act as exceptional flavor stabilizers, meaning the liquid retains its core flavor profile long after carbonation begins its slow decline.
Diet / Zero-Sugar Sodas (All Containers): Best within 3 months past the stamped date. Artificial sweeteners—specifically aspartame—possess highly fragile chemical bonds that disintegrate rapidly at room temperature. A year-old diet soda isn’t toxic, but it will taste completely flat and bitter because the sweetener has literally dissolved into nothingness.
Plastic Bottled Sodas (All Varieties): Best within 3 months past the date. Unlike infinitely sealed aluminum or glass, polyethylene terephthalate (PET) plastic is highly porous at a microscopic level. Carbon dioxide gas molecules slowly pass straight through the plastic walls, leaving your bottled drinks completely flat far faster than a canned counterpart.

🥫 Wait! Don’t toss that can yet. Think that “use-by” date on your canned corn is a hard deadline? You might be surprised. Check out the real truth about how long canned food actually stays safe to eat.

The Limits of Shelf-Stability: Can You Drink a 50-Year-Old Soda?

If you find a can of 2-year-expired soda in the back of your pantry, the outcome is completely predictable. From a microbiological safety standpoint, nothing will happen to you if you open and drink it; you will not get food poisoning. However, from a quality standpoint, a two-year-old beverage, especially if it is a diet variety or trapped in a porous plastic bottle, will likely taste stale, noticeably flat, and completely lose its refreshing edge.

What about a very old, 50-year old soda? This is where the rubber meets the road, or rather, whether the theory meets the evidence. The acidic environment inside a can or bottle of soda pop is thought to not support the growth of bacteria. So, just as with a 2-year old soda an antique bottle of Coca-Cola may be safe to drink, but you can bet it will be completely flat, will have lost much of its flavor, and will taste strange, if not foul.

However, we also don’t actually know whether it’s completely safe to drink because, as you could have guessed, nobody has carried out scientific experiments to test whether a 50-year-old soda pop is safe to drink. Nobody knows what will happen if you drink a soda that old. So, if you come across some old, discontinued soda that you always wanted to try, it’s probably best not to try it!

In other words, when I said above that nothing will happen if you drink a soda that appears to be expired, I was talking about a soda that was only a few months or several months past its prime. If you are foolish enough to taste a 50-year-old soda, or even a 20-year-old one, no article can help you. You’re on your own!

Deciphering Manufacturer Lot Codes and Expiration Stamps

The dates you will find on a soda label or stamped on the bottom of soda can indicate different things on different products. On some sodas, the date is a manufacture date. On others, the date is a sell-by date. Both use an MMMDDYY date, except Pepsi leaves spaces between each date component (MMM DD YY). This means the date will read as a three letter month abbreviation, a two-digit day, and a two-digit year. Therefore, the date JUN2125 (JUN 21 25) indicates a sell-by date of June 21, 2025.

How to Find Expiration Dates on Coca-Cola and Pepsi

Coca-Cola Cans: Look at the bottom of the can.
Coca-Cola Bottles: Check the cap or the upper “neck” of the bottle.
Pepsi Cans: Look at the bottom of the can (note that Pepsi often uses spaces: MMM DD YY).
Pepsi Bottles: Check the cap or the shoulder of the bottle.
7Up & A&W: Look for a Julian date code (MM DDD Y) on the bottom of the can.

7Up, A&W, and Canada Dry Codes

Unlike Coke and Pepsi, these brands often use a Julian Date code to indicate when the beverage was bottled.

The Format: Typically MM DDD Y
How to Read It:
- MM: The manufacturing plant code.
- DDD: The day of the year (001 to 365).
- Y: The last digit of the year.
Example: A code of “01 059 6” means the soda was made on the 172nd day of 2026 (February 28, 2026).

📅 Shelf-Life Tip: Regular 7Up and A&W are best within 9 months of this date, while diet versions should be consumed within 3 months. Canada Dry products are more shelf-stable and maintain quality for up to 39 months.

Common Questions About Expired Soda

How long is soda safe to drink after the expiration date? Unopened regular soda is generally safe for 6 to 9 months past the “best-by” date, while diet sodas typically maintain quality for 3 months. Because soda is carbonated and acidic, it is not a hospitable environment for bacteria, making it a matter of taste and carbonation rather than safety.
Does diet soda expire faster than regular soda? Yes, diet soda expires faster because artificial sweeteners like aspartame break down chemically over time, losing their sweetness and altering the flavor. While still safe to drink, diet soda will taste “off” much sooner than sugar-sweetened soda, which acts as a better preservative for flavor.
Is it dangerous to drink flat, expired soda? Drinking flat, expired soda is not dangerous, but it will be unpalatable. As carbon dioxide escapes the container, the soda loses its “bite” and the flavor profile shifts. Unless the container is damaged, leaking, or showing signs of mold, the primary risk is a poor-tasting beverage.
Can you get food poisoning from old soda? It is highly unlikely to get food poisoning from old soda if the seal is intact. The high acidity and lack of nutrients in most soft drinks prevent the growth of harmful pathogens. However, you should always inspect the container for bulging, rust, or leaks before drinking.