How Long Does Soda Last?
Unopened regular soda keeps its quality for 6–9 months in the pantry, and diet soda for 3–4 months. Once opened, soda stays fizzy for 2–4 days in the fridge with the cap on tight.
Soda — unopened
shelf life- Unopened, diet: 3–4 months in the fridge
- Opened: 2–4 days in the fridge
Fridge at 40°F (4°C) or below · freezer at 0°F (−18°C). Freezer times are for best quality; frozen food stays safe longer.
Soda is carbonated water with sweetener, acid and flavorings, sealed under pressure in cans or bottles. The combination of acidity, carbonation and a sterile sealed package means it essentially never becomes unsafe. What changes is quality: carbon dioxide slowly escapes, especially through plastic, and artificial sweeteners in diet soda break down and lose sweetness.
How to store soda
- Store cases in a cool, dark place, not the garage or a hot car trunk; heat drives off carbonation and speeds the breakdown of sweeteners in diet soda.
- Screw the cap back on firmly right after pouring, and keep the bottle cold, because cold liquid holds dissolved gas far better than warm.
- Buy smaller bottles or cans if a 2-liter always goes flat before you finish it.
- Never leave a can or bottle in the freezer to chill quickly and forget it; the water expands as it freezes and the container can split or burst.
How to tell if soda has gone bad
- No hiss on opening and no bubbles in the glass means it has lost its carbonation.
- A dull, metallic, syrupy or chemical taste, most noticeable in old diet soda.
- Cans that are leaking, heavily dented on a seam, rusted or bulging should be discarded unopened.
- Cloudiness, floating particles or mold in an opened bottle that someone drank from directly.
Bacteria that cause food poisoning usually do not change the look, smell or taste of food. Go by the time limits first, and the signs above second.
Soda shelf life chart
| State | Fridge | Freezer | Pantry |
|---|---|---|---|
| Unopened | 6–9 months | Not recommended | 6–9 months |
| Regular, sugar-sweetened soda. Cans hold carbonation longer than plastic bottles. | |||
| Unopened, diet | 3–4 months | Not recommended | 3–4 months |
| Aspartame and other sweeteners degrade over time and in heat, leaving a flat, off taste. | |||
| Opened | 2–4 days | Not recommended | Not recommended |
| Quality only: it goes flat. An opened can cannot be resealed, so plan on 1 day. | |||
Not safe = perishable: no more than 2 hours at room temperature (1 hour above 90°F / 32°C). Not recommended = possible, but quality suffers or it serves no purpose.
Frequently asked questions
Is it safe to drink expired soda?
Yes, in almost all cases. The date on soda is a best-by date for taste and fizz, not a safety cutoff, and a sealed can or bottle does not support bacterial growth. Soda well past its date will be flatter and may taste off, particularly diet soda. Discard any container that is leaking, bulging or rusted.
Why does diet soda go bad faster than regular soda?
Because its sweeteners are less stable than sugar. Aspartame in particular slowly breaks down in an acidic liquid, and faster in warm storage, so the drink loses sweetness and develops an odd aftertaste within a few months of its date. It is a flavor problem rather than a health hazard.
How do you keep an opened soda from going flat?
Keep it cold and keep the cap tight. Carbon dioxide stays dissolved much better at fridge temperature, and every minute the bottle stands open lets gas escape. Squeezing the air out of the bottle does not help. Even with good handling, expect 2–4 days before a 2-liter tastes noticeably flat.
Can soda that froze and thawed still be drunk?
Yes, if the container is intact, although it is usually flat afterwards because freezing forces the carbon dioxide out of solution. Check the can or bottle carefully first: a bulged or split container may have leaked and should be thrown away. Open a thawed can slowly, pointed away from you.
Related foods
| Food | Fridge | Freezer | Pantry |
|---|---|---|---|
| Bottled Water Opened |
3–5 days | Not recommended | 1–2 days |
| Beer Unopened |
6–8 months | Not recommended | 4–6 months |
| Lemonade Homemade |
5–7 days | 3–4 months | Not safe |
| Kombucha Opened |
1 week | Not recommended | Not recommended |
| Apple Juice Opened |
7–10 days | 8–12 months | Not safe |
| Champagne & Sparkling Wine Opened |
1–3 days | Not recommended | Not recommended |
More soft drinks: Protein Shakes.
Reviewed 2026-09-20. Times follow published USDA FoodKeeper / FSIS, FDA and CDC storage guidance; where sources differ we use the shorter time. How we compile this data.