Properly stored, sealed canned seltzer keeps best quality for about 9 months to a year, though you should finish an opened can within a few days.
Canned seltzer rarely “goes bad” the way dairy does, but flavor and carbonation fade with time. The shelf life of your sparkling water depends mostly on whether the can is still sealed, plus the type of seltzer you bought. The quick version for how long canned seltzers last: unopened cans hold their quality for roughly 9 months to a year, while opened cans start going flat within hours and lose peak taste after about 2 to 4 days in the fridge.
The date stamped on your seltzer can is about quality, not safety. Here’s what that date means, how long each type lasts, and the storage habits that keep your cans crisp.
What The Date On The Can Actually Means
The package date printed on seltzer cans is a “best by” or “best quality” marker, not a safety deadline. Seltzer won’t make you sick after that date passes, but the carbonation and flavor will be noticeably weaker. The quality decline happens gradually, so a can a few weeks past its date is still perfectly drinkable, just less lively.
Think of the date as a freshness guide rather than an expiration warning. Most people can’t taste a meaningful difference until well past the printed date, but the fizz does fade as time goes on.
How Long Does An Unopened Can Of Seltzer Last?
Hard seltzers follow a similar timeline. White Claw states its hard seltzer is best enjoyed up to a year after it’s been produced. That production-based window is slightly longer than the general seltzer guideline, so check the brand’s own guidance when you have it.
What Happens After You Open A Can?
An opened can of seltzer is a different story entirely. Once the seal breaks, carbonation starts escaping immediately, and the drink goes flat within hours. Even then, expect noticeably weaker bubbles by day two.
If you’re not finishing a can in one sitting, popping it in the fridge with a lid or some plastic wrap slows the fizz loss, but it won’t stop it. Your best bet is to drink it the same day.
Storage Mistakes That Shorten Seltzer Shelf Life
Heat is the main enemy of unopened seltzer. A pantry or cabinet away from the stove and direct sunlight holds carbonation best. Extreme temperature swings also degrade quality faster than consistent storage.
Once opened, the clock speeds up dramatically, and leaving the can on the counter instead of refrigerating it cuts that 2 to 4 day window down even further. Another common mistake is assuming every seltzer ages the same, but brand-specific guidance like White Claw’s one-year window shows why reading the label matters.
| Seltzer Type | Best Quality Window | Storage Note |
|---|---|---|
| Unopened canned seltzer | About 9 months after package date | Pantry or fridge both work |
| White Claw hard seltzer | Up to 1 year after production | Brand-specific guidance |
| Opened seltzer | 2 to 4 days refrigerated | Requires continuous refrigeration |
For anybody stocking up on sparkling water, knowing the shelf life is only half the equation. The top-rated canned seltzers worth stocking can help you pick cans that stay crisp longest and match your taste.
The bottom line on how long canned seltzers last is simple. Unopened cans keep peak fizz and flavor for about 9 months to a year, and an opened can is best finished within a few days. Treat the package date as a quality marker rather than a safety warning, store unopened cans in a cool spot, and refrigerate anything you open. That routine keeps every can as crisp as it was meant to be.
FAQs
Can drinking expired seltzer make you sick?
No, drinking seltzer past its package date won’t make you sick. The date marks peak quality for carbonation and flavor, not safety. A can that’s months past its date is safe to drink, though it will taste noticeably flatter and less crisp than a fresh one.
Why does my opened seltzer go flat so fast?
Carbon dioxide escapes the moment a can is opened, which is why bubbles fade within hours. Refrigerating an opened can with a lid slows the loss, but even cold storage only preserves decent quality for about 2 to 4 days before the drink tastes flat.
Does refrigerating unopened seltzer extend its shelf life?
Cold storage keeps the drink colder from the start, but it doesn’t slow quality decline beyond what room temperature already provides.
References & Sources
- StillTasty. “Seltzer, commercially canned or bottled.” Provides the 9-month best-quality window for unopened seltzer and 2-4 day guidance for opened cans.
- White Claw. “White Claw Support: Shelf Life.” States hard seltzer is best enjoyed up to a year after production.