Even if refrigerated, coffee doesn’t stay fresh forever. Over time:
* The aromatic compounds that give coffee its rich smell begin to disappear.
* Oxygen reacts with the coffee, causing oxidation, which can make it taste stale or bitter.
* Reheating can further reduce its flavor and aroma.
So while yesterday’s coffee is often still safe to drink, it usually won’t taste as fresh as a newly brewed cup.
What’s the best way to store leftover coffee?
If you plan to drink it later:
* Let it cool slightly.
* Pour it into a clean, airtight glass or stainless-steel container.
* Refrigerate it as soon as possible.
* Reheat only the amount you plan to drink, rather than reheating the entire batch repeatedly.
Should you reheat coffee?
You can, but keep in mind that every reheating cycle slightly changes the flavor. Many coffee lovers prefer drinking leftover coffee cold or over ice instead of reheating it because it preserves more of the original taste.
The bottom line
Day-old black coffee is usually safe to drink if it has been stored properly in the refrigerator for up to 3–4 days. However, its flavor and aroma gradually fade, so it may not taste as enjoyable as a freshly brewed cup. If your coffee contains milk or cream, it’s best to drink it within 1–2 days and never leave it unrefrigerated for long.
