The good news: No, coffee doesn't really “go bad” in the way that bread grows mold or a banana slowly rots on your countertop. And drinking coffee made from old beans won't make you sick, even if the expiration date has passed. (We can't vouch for the taste, though.) Coffee will lose quality over time.25 Aug 2020
Can I make coffee with expired coffee grounds?
If you were to accidentally brew a pot of coffee with old or expired coffee grounds, it will not harm you. It's not going to taste very nice, though.
How do you know if ground coffee is bad?
The best way to tell if it has gone bad is to use your nose. If coffee has gone bad, the pleasant aroma will be gone and with it much of the taste. Using this coffee will not harm you, but will just not have much flavor if the smell is gone. It may also lose its deep dark color and appear a lighter brown.21 Apr 2015