How Long Are Eggs Good for After Expirationの概要と注目ポイントをわかりやすく整理しました。

First things first: that printed date is usually a “sell by” or “best by” date, not a safety deadline. Manufacturers use it to tell stores when to rotate stock, not to judge your breakfast.

In fact, the USDA says eggs can be perfectly good for 3 to 5 weeks past that date—as long as they’ve been refrigerated. So, yes, you’ve likely been throwing away perfectly edible, delicious eggs. Oops!

The Float Test: Your New Favorite Party Trick

Want to know if your “expired” eggs are still fresh? Forget the date—use the float test! Fill a bowl with cold water, gently drop in an egg, and watch what happens.

If it sinks and lies flat on its side, it’s super fresh. If it sinks but stands on one end, it’s still fine—just a little older. But if it floats to the top, that’s your cue to say goodbye.

Why does this work? Over time, eggs lose moisture and their shells become more porous, allowing air in. That air pocket makes them buoyant. It’s science, but it’s also magic for your Sunday scramble.