The Truth About Drinking Ground Coffee Past Its Expiration Date

Almost every caffeine fiend has been there. You have enough coffee left to eke out one last pot, but the darn bag has somehow expired — or so it may seem. That bag's stamp probably says something like "best by," which, while suggesting freshness like other perishables, is actually pretty vague. Coffee also just seems like it should be among the items that don't ever really expire. So, Chowhound ground down some answers with Clint Proctor, founder of coffee catering company Conlan Coffee, and Jason Richter, CEO and head roaster of Path Coffee Roasters. 

"Unlike on products like baby formula, medicine, or milk, coffee expiration dates are arbitrary and based on what the roaster and/or the customer requires to help with sell-through," Richter says. "The only issue you can have with older coffee is a lack of acidity being present in the cup, and if it's very old, some woody flavors."

"If your ground coffee has been stored in a sealed container, the expiration or 'best by' date is typically more about quality than safety," Proctor says. "Once it passes the expiration date, the coffee will usually still be safe to brew and consume, but the flavor may be flat or papery compared to fresh coffee." But that peak quality may have come and gone regardless of the date on the package. Ground coffee is only at its best within a few weeks of opening, losing flavor with each passing day. There are also a few things you can look out for to decide if it's even worth making a batch.

Coffee's signature smell — whether whole bean, ground, or brewed — is probably the first thing most people think of when they imagine a cup of joe. Once that's gone, so is your chance at a truly superior sip. "I recommend to start by smelling the grounds," Clint Proctor says. "Coffee should have a strong, pleasant aroma. If your grounds have a faint or stale smell, there's a good chance your coffee has lost a lot of its flavor." He also said if you notice moisture, clumping, mold, or other signs of spoilage, it's best to toss the coffee altogether.

Luckily, you can stave off this tasteless, fragrance-free coffee by making a few adjustments to your routine. Whole coffee beans typically last longer than ground coffee, so you can start by buying those instead of the pre-pulverized stuff. Plenty of great coffee grinders are sold for pretty cheap online, and many are small enough that you won't have to sacrifice much cabinet space. This one little entry-level purchase might even get you well on your way to a whole DIY coffee bar that can get every cup closer to cafe quality and never taste past its prime.